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  1. To clarify the prior post, when I say 500 watt EVGA power supply I am talking about the non-modular model (12.1 watts under a no load condition). When I say 550 watt EVGA power supply I am talking about the fully modular model (3.8 watts under a no load condition).
  2. I ended up buying the following top of the line real time Watt meter from Amazon for $27.99. It has now fallen in price to $26.99 (Amazon prices can change daily or weekly depending on demand and inventory levels). https://www.amazon.com/gp/product/B07J6SD4R8/ I compared the 550 watt fully modular and 500 watt modular EVGA power supplies to the 28.5 Watt Mean Well power supply. For the Mean Well 28.5 watt power supply (model GP25B13A-R1B) that is energy efficiency level VI rated, when the power supply is plugged in to the electrical outlet with no load, the power supply uses exactly 0.0 wattage according to the Watt meter. However, since the green LED light is on the power supply I am guessing that this Watt meter really does not measure between 0-1800 watts (or 0 to 1650 watts depending on what spec info one is reading). According to the Mean Well spec sheet the GP25B13A-R1B power supply uses less than 0.3 watts of power under a no load power consumption. However, the watt meter I purchased appears to not be able to measure under 1 watt or under a half a watt, since the display on the watt meter should be reporting something around 0.1 watts for the Mean Well power supply. With the Mean Well power supply plugged in with no load, the wattage is too low for the real time watt meter to measure (spec sheet mentions under 0.3 watts with no load). When the ColecoVision console is turned on with no cartridge the Mean Well power supply uses 7.0 watts of power. When a typical 80’s game cartridge is inserted the Mean Well power supply uses 7.5 watts of power. When a ATARIMAX 128 in 1 USB flash cartridge is inserted the ColecoVision uses 8.4 watts of power with the Mean Well power supply. Depending on what one has plugged into their Expansion Module #3 ADAM computer they well get different wattage draws. With the Expansion Module # 3 ADAM computer inserted without a Digital Data Drive attached the wattage on the Mean Well goes up to 12.8 watts. If one attaches the Digital Data Drive the wattage goes up to 14.2 watts of power. If one inserts a Digital Data Pack into the Digital Data Drive, even without the DDP (tape) moving the wattage goes up to 15.8 watts just by inserting a DDP. When the Digital Data Pack is traveling at high speed the wattage goes up to 22.4 watts of power. The maximum the Mean Well power supply can put out is 28.5 watts. With a fully loaded ADAM computer with expansion cards that might be enough power. However, if in the future one wanted a high-end third party HDMI graphics card (which does not exist, at least not yet), then one would want a power supply with a lot more wattage for their ColecoVision/ADAM. When I tested the fully modular EVGA 550 watt 220-B5-0550-V1 power supply with no load it uses a total of 3.8 watts when the ECO mode is on (fan never spins with very low loads and with very low heat). However, if I turn the ECO mode off the no load on the power supply goes up to 4.5 watts of power with the fan spinning. So the EVGA 550 watt power supply if it were modified with a -5 volts DC add on module and the correct wire harness is used a minimum of 3.8 watts of power under a no load condition. The 28.5 watt Mean Power supply in theory well use no more then 0.3 watts of power under a no load condition. That 3.8 watts of power for the 550 watt EVGA is always used for a no load power condition on the EVGA power supply. The desktop PC of course one just flips a switch and the power supply well use zero voltage since the power supply would be completely turned off when the computer is turned off. However the power supply I used to add a ColecoVision wire harness was the EVGA modular 500 watt power supply model number 100-W3-0500-K1. That power supply is not as energy efficient when compared to the fully modular model that only uses 3.8 watts under a no load condition. The lower cost modular 500 watt EVGA power supply uses 12.1 watts of power under a no load condition (the problem is these lower end models do not have a ECO mode to disengage the low noise fan). So one needs to calculate a automatic 12.1 watts of power usage when this EVGA power supply is on with no load. Which means if one subtracts 12.1 watts of power from the following numbers, they well get the true number of how much power the ColecoVision/ADAM system is using. So, no load wattage on the 500 watt EVGA power supply is 12.1 watts of power. With the ColecoVision turned on and no cartridge inserted the wattage was 18.6 watts. With a 80’s game cartridge inserted the wattage went up to 19.0 watts. When the ATARIMAX 128 in 1 USB flash cartridge was inserted the wattage went up to 20.1 watts. When the Expansion module #3 ADAM computer was inserted with no Digital Data Drive attached the wattage went up to 24.6 watts. When the Digital Data Drive was plugged in the wattage went up to 25.6 watts. When a Digital Data Pack (tape) was inserted the wattage went up to 27.0 watts. When the Digital Data Drive is moving at high speed the wattage went up to 33.7 watts (between 32.9 to 33.7 watts). Again since this 500 watt power supply has a no load of 12.1 watts, one needs to subtract 12.1 watts from the above numbers to get the real amount of wattage the ColecoVision is using. The entry level EVGA 550 watt fully modular power supply is a much better power supply with only using around 3.8 watts of power under a no load condition instead of 12.1 watts of power under a no load condition. However the -5 volts DC add on modules that are ideal to use with a fully modular power supply are large and can cost $20-$30+ for entry level models (one purpose of a fully modular power supply is so that one does not need to open up the power supply to swap out the wire harness, since everything is done externally). I prefer EVGA fully modular power supplies but for this project I needed to go with a modular power supply because of the very small -5 volts DC module and high quality diode that needed to be attached to the wire harness in order to power the ColecoVision/ADAM system. The advantage of a 500 watt or 550 watt power supply for the ColecoVision/ADAM is that one day one may need a lot of wattage for a graphics card with built in SGM and HDMI port. Power consumption is just one part of the equation when looking for a power supply.
  3. Brief Amiga power supply information If one owns an Amiga computer that requires -12 volts DC, +12 volts DC, and + 5 volts DC, then the best solution is to go with a ATX power supply like the fully modular entry level EVGA 550 watt 220-B5-0550-V1. As long as one has access to the original Amiga wire harness the connection process is fairly simple without one needing to open the power supply if one goes the fully modular route. The entry level EVGA 220-B5-0550-V1 power supply has 0.5 amps on the -12 volt DC rail where as some other EVGA power supplies only offer 0.3 amps on the -12 volt DC rail. The advantage of a fully modular ATX power supply for use on a computer like the Amiga, is that the power supply does not need to be opened up and the manufactories warranty is still valid if the power supply seal is not broken. In addition, one can unplug the fully modular Amiga cable from the EVGA power supply and plug it into another model of fully modular power supply in the rare chance that the power supply goes bad. So fully modular power supplies are the best to use even on classic 70’s, 80’s and 90’s computers. On these new models of EVGA power supplies an external reset switch needs to be wired up to reset the circuit breaker after a short occurs (that is the way most or all brands of ATX power supplies are now, in the old days EVGA power supplies allowed a simple flipping of the on/off switch to reset the circuit breaker, now one has to wire up a momentary reset switch to reset the internal circuit breaker to recover from a short). The Amiga computer is a much easier computer to get working with a ATX power supply since all ATX power supplies have -12 volts DC (Its currently not possible to find an Amiga connector presold with a wire harness, so that is the hardest part of getting an Amiga to work with a ATX power supply is to find or make an existing Amiga power cable (many people use the existing power cable from their old broken original 80’s Commodore Amiga power supply). It is much harder to get the ColecoVision and ADAM power supply to work with a ATX power supply since -5 volts DC feature is required. Since external self-contained -5 volt DC add on regulators that would connect to a fully modular power supply are really expensive and large, and sometimes costing as much as the fully modular power supply, adding -5 volts DC to a fully modular power supply is not practical because of the size and price of the external -5 volts DC modules. So if one wants a entry level 550 Watt fully modular EVGA power supply to use with Amiga or other computer system, the New Egg website has the power supplies on sale for $44.99 plus free shipping (sometimes they also have a $10 rebate at certain times of the year). But remember the fully modular ATX power supplies come with the standard cables to hook up to a modern day computer motherboard, and if one wants to use it with a Amiga computer they have to create their own fully modular Amiga power cable. How to make your own ColecoVision/ADAM power supply using any modern day ATX power supply on the market How to add -5 volts DC rail to any power supply that currently has a + 12 volts DC rail (Recommended for ATX power supplies only since they offer a cleaner DC output) **** Warning it can be dangerous opening up a ATX power supply since there is both high current AC and DC that can be lethal. One can be electrocuted and possible die if they open up and work on a power supply that is still plugged into the AC power line. Therefore, only experienced technicians who disconnect the power cord from the AC outlet should be working on this power supply. Also opening the power supply voids the original manufactories warranty. *** The following items are either required or recommended for this project (other minor items may be required that are not mentioned in this post, like a digital multi-meter) (one) EVGA ATX power supply or other brand of ATX power supply between 400 watts to 1600 watts (Current models of EVGA power supplies are made in the country of Taiwan using a quality automated robotic factory). Recommended somewhere between 400 to 650 watts. Also recommended a non-modular model, since fully modular is not practical when adding a -5 volts DC regulator with a high quality Schottky Rectifier Diode. Technically a fully modular power supply would also work, but the purpose of a fully modular power supply is to use external wire harnesses so that the power supply does not need to be opened up. Back in June of 2021 I was able to buy the 500 watt EVGA 100-W3-0500-K1 model for only $29.99 on sale plus taxes and shipping (However now that power supply is $54.99). Currently New EGG is running another special and what appears to be a little better quality power supply called the EVGA 510 watt 100-BP-0510-K1 can be purchased on sale for $29.99 each with free shipping (sometimes a $10 rebate is offered). All EVGA power supplies on the market and all or most other brands are not UL listed even the top of the line $600 models. UL listed is an optional certification in the United States that requires a minimum of a $13,000 fee for each model to receive that certification. However, the EVGA power supplies are FCC certified and CE Europe safety certified. But I have not tested and tried the EVGA 510 watt 100-BP-0510-K1, at least not yet, but the specs show that power supply being a little better quality compared to the one I used for this project back in June 2021. (two) 24/20Pin ATX Bench Board Computer PC Power Supply Breakout Adapter Module (a high quality made in China item that now costs $12.35 each plus free shipping due to inflation: I have used one of these items for many years. It only takes 15 to 30 minutes to wire one of these things up and the main purpose is to connect your ATX power supply to the equipment you are hooking up before actually wiring up the ATX power supply internally (connects to your wire harness). This ATX bench board is too large to fit in the ATX power supply but allows one to test wire harnesses for the Amiga, Adam, Colecovision and many other systems. While this item is not required to make this project work, it can be a great time saving device to have. ** One needs to place this ATX Bench Board on a plastic surface or some other insulating device so that one does not get electrocuted or cause a short condition. 24/20Pin ATX Bench Board Computer PC Power Supply Breakout Adapter Module | $12.35 (three) Misc items needed to cover up any exposed wires on the wire harness during the modification process: The key goal of making modifications to a EVGA non-modular power supply is to never mess around with the original circuit board soldering that was performed by automated machines in the EVGA factory. So all one is doing for this project is removing the existing IBM style wire harness and in its place one is installing a ColecoVision or ADAM style wire harness. Technically one could have three wire harnesses (Amiga, Adam, and ColecoVision all from one power supply). For this project I used a combination of UL listed CE1X terminal caps for some of the connections (I kept some spare wires in the power supply to add a Amiga or ADAM wire harness in the future). However, the bag of CE1X terminal caps now shipping this year for some reason do not have the UL listed symbol on the bag when people have bene reordering them currently (not sure why since several bags I have say UL listed on them). They cost around $7.89 from China with free shipping from China. Due to a space issue inside the power supply I had to cut back the original wire harness as far back as possible and to use a UL approved product called liquid electric tape to insulate the wires I cut back. However, the stuff is toxic until it dries and one has to wear rubber gloves and a mask unless one can hold their breath (safety goggles for eye protection is also ideal). UL approved liquid electric tape is expensive but it sometimes is needed on certain ATX power supplies where there is a space issue and the CE1X terminal caps would take up too much space. Star Brite liquid electrical tape is made in the USA and it currently costs around $13.38 for a 1 ounce tube (color black). Also for interfacing the existing ATX wire harness with the ColecoVision wire harness a pack of these CE certified Barrier Screw Terminals is ideal for $10.99 from China. (three) -5 volts DC add on regulator module: While -5 volts DC regulators for $2.78 and lower have been around for many years. Those models of DC regulators always required soldering onto a circuit board. The average external -5 volts DC regulator that would connect to a fully modular power supply costs between $20 to $40+ and the modules are very large and for various reasons are not practical. According to two PDF spec sheets, there was a low cost under $10 -5 volt DC regulator released in January 2020 and another one released in April of 2021. The advantage of these DC regulators is that they are insulated small modules that have a 22 AWG wires that allow direct connection to ones existing wire harness (see attached PDF spec sheets). The CUI VX7805-500-W is made in China and can be purchased for $6.17 each plus free shipping from Arrow Electronics. It has a Mean Time Before Failure rating of 2,000,000 hours. The official specs mention -5 volts DC and -0.3 amps DC current when the black and yellow wires are reversed (yellow becomes ground and black becomes -5 volts DC output). However, I discovered that the Recom R-78W5.0-0.5 which is made in Taiwan well also work as a -5 volts DC regulator even though the specs officially only mention +5 volts DC. If one switches the black and brown leads so that the brown is ground and black is -5 volts DC, the Recom well act just like the CUI module even though the specs do not officially mention the -5 volts DC feature. Both -5 volts DC regulators connect to any of the yellow ATX power supplies +12 volts DC yellow wires, and both mention that one may need to use capacitors on the input and output voltage of the -5 volts DC regulator in order to reduce the ripple and noise (see spec sheets for capacitor values). I tried many different capacitor values over several weeks, and I discovered that the 12 volts DC output from the EVGA ATX power supplies already have a low noise and low ripple. I discovered that it is better to not use any capacitors with EVGA ATX power supplies and most likely many other ATX power supplies on the market. In fact, sometimes the performance and the reliability of the output was reduced when using the recommended capacitors. So, no capacitors at all was the best in my experience since the EVGA already has low noise and low ripple output on the 12 volt DC rail that is feeding the -5 volts DC regulator. However maybe some low end non ATX power supplies that offer noisy +12 volts DC output might be needed as capacitors to clean up the input and output voltage of the regulator. Sometimes the CUI -5 Volts DC regulator appeared to have a better picture quality then the Recom model, other times with certain ATX power supplies the Recom may perform better. Both the CUI and Recom -5 volts DC regulators have built in output short protection to ground, where the modules themselves well stop outputting -5 volts DC until the short to ground is removed. However, both the CUI and Recom modules were not designed to handle a massive 40 amp +12 volt DC short (or 18 amp +5 volts DC short) to the output of the -5 volts DC regulator. Within a few seconds the CUI and Recom modules well be destroyed if the 12 volt DC or 5 volts DC rail gets shorted to the -5 volts DC add on module (when the add on regulator is destroyed sometimes instead of outputting 0 voltage, they instead start outputting +6 to +9 volts DC instead of -5 volts DC). But the CUI module from China would sometimes do 0 volts instead of 6 to 9 volts DC when being destroyed by massive current. The Recom module had more of an issue of not going to zero volts after being destroyed). However, the good news is by adding a high quality Schottky Rectifier Diode the -5 volts DC regulator is never destroyed and the EVGA power supply circuit breaker instantly trips when + 12 volts DC or + 5 volts DC is shorted to the -5 volts DC output. (four) High quality Schottky Rectifier Diode: Many different brands and models of Diodes would burn up and could not take the heat and multiply shorts of 40 amps at 12 volts DC. However, the best quality diode I ran into for performance is the Chanzon brand from China that is rated at 20 amps at 45 volts for only around 83 cents each x 10 (sold in a pack of 10). The Chanzon model 20SQ045 diode that is made in China uses high temperature epoxy for enhanced mechanical strength and it can handle a peak forward surge current of 450 amps at up to 45 volts DC. A 1600 watt EVGA power supply only puts out a maximum of 133.3 Amps on its 12 volt DC rail. Since negative current cannot pass though a DIODE (anode cannot be made more negative than the cathode), this means that the Schottky diode blocks the negative current from the -5 volts DC module from going to ground. If the diode was not there then the -5 volts DC output from the regulator would be automatically turned off since it would be shorted to ground, but since the diode is blocking negative current going to ground this means that the -5 volts DC regulator well continue outputting -5 volts DC to the wire harness unless one shorts the -5 volts DC to ground using a different path that bypasses the diode. However as soon as the fast acting Schottky diode sees any positive voltage like +12 volts DC or +5 volts DC, it well instantly send that positive voltage to ground, which causes the EVGA circuit breaker to instantly trip and protect the -5 volts DC regulator from being destroyed. Therefore, unlimited shorts are possible since the diode can handle 45 volts DC at up to 450 amps forward surge current. Just make sure the Schottky diode is wired correctly or -5 volts DC module well be shorted to ground and there well be no -5 volts unless the diode is placed on the wire harness correctly. Also the diode surge protection depends on the anode and cathode being placed on the wire harness correctly. Cutting the metal leads back on the diode until the high temperature terminal block covers the metal leads completely is also needed so that the diode metal leads are 100% insulated. Now the -5 volts DC module is protected from all shorts (+12 volts DC to -5 volts DC short, and +5 volts to – 5 volts DC short have full circuit breaker protection). -5 volts DC to ground does not use circuit breaker protection since the -5 volts DC regulator automatically turns off the -5 volts DC output until the short is removed. (five) A important device that is needed to reset the circuit breaker in all new model EVGA ATX power supplies and many other ATX power supplies on the market: In the old days EVGA ATX power supplies and most other ATX power supplies after one got a short and tripped the circuit breaker, all one needed to do was to flip the on/off power switch on the power supply to recover from a short. However now with the latest models flipping the on/off power switch and even unplugging the power cord results in the circuit breaker not being reset. To reset the circuit breaker, one needs to wire up a button like what is on the ATX Breakout adapter. For example, desktop computer cases have a momentary style reset button. Therefore, one needs to wire up some type of reset switch from the ATX PS ON circuit to ground. I ended up finding a high quality normally closed black push button switch with wire harness for only around a $1.00 with free shipping. The catch is you have to buy a 10 pack for around $10 at Amazon. It works really well to recover from a short every time the push button is pushed. To mount it to the ATX power supply case you need to drill a small hole using either a 17/64 (.265) drill bit or a 6.70mm drill bit. But then a 8.0 x 1.25 tap size bit needs to be used. While most people own a drill already, I have never owned a drill in my life. Instead of borrowing a drill from someone, I ended up spending over $1,000 on the proper equipment to drill a hole for a switch that costs only a $1.00. I most likely well use the drill for other projects and its nice to finally own a drill. It is expensive getting the proper tools to drill a hole through metal. I needed to get a quality vise grip that is portable and can be attached to any workbench (also some rubber jaw clamps). The drill guides and clamp were nice. The Cobalt steal drill bits do a real nice job of cutting through metal. The made in China Tap and Drill set for $59.00 with free shipping was a good value. It is kind of funny I buy a $1.00 switch and to mount it to a metal ATX power supply properly I end up spending over $1,000+ on the proper equipment since I never owned a drill before. Those that already own quality drilling equipment well just need to buy the $1.00 switch from Amazon. Important step: The ATX power supply one and only green cable is the “power on sensor” that must be wired to any black ground cable so that the ATX power supply well turn on (With the momentary switch in the circuit in between the green wire and ground wire so that the power supply can recover from a short with a simple push of the button). While it only takes around 15 minutes to 30 minutes to connect the EVGA power supply up to the external ATX Breakout adapter mentioned in this post and pictured below. The problem is that adapter is too big to fit inside a ATX power supply. I ended up spending around 4 hours on each power supply to make the internal conversion to the wire harness. This project is a lot of work if one is going inside the power supply. Some people might decide to just create a plastic case for the ATX Breakout board and not go inside the power supply. But if one goes inside the power supply cosmetically the power supply looks much better but it may take some people 4 hours, especially when one might want to drill a hole and mount a reset switch for the circuit breaker feature. Instead of spending hours repeating myself, here is an old thread that shows the correct pinout information to use with the ColecoVision compatible wire harness If one has a ADAM computer wire harness here is an old threads on how to wire up a ADAM wire harness to a ATX power supply. More useful ATX color codes. This link has useful information regarding the ATX power supply wire colors and what voltage levels is assigned to the wires inside the power supply and the ATX 24 pin connector. Study the picture attached using the ATX breakout board. Once that is working properly then one should consider maybe going inside the power supply to wire up the wire harness without using the external ATX breakout board. For skilled technicians only do to high voltage and current issues. Also consider replacing the existing ColecoVision power cord with an 18 gauge double shielded gold plated one for this project. vx78-500-w.pdf R-78W-0.5.pdf 20SQ045-1.pdf
  4. That is a good question, I never had anyone ask me how much wattage a power supply uses when under a load, I just spent over two hours trying to find an answer to your question. We know that this EVGA ATX power supply can provide a maximum of 500 watts output when connected to a home computer that has a graphics card that requires 500 watts (and most modern computers 50 to 70 watts well be used with this EVGA power supply when the computer is running at idle mode with no gaming, no web browsing, and just sitting around not being used). All ATX power supplies are except from the level VI power consumption rules that the Department of Energy put in place back in Feb 10th of 2016 (ATX power supplies are designed for internal use and the rules only cover external power supplies when it comes to being level VI complaint). However, this ATX power supply has received an 80 Plus efficiency certification that ensures the power supply isn’t wasting power and turning it into excess heat. Under most loads this EVGA power supply is 80% efficient or higher. However, to answer your question about how many kill-a watts this EVGA power supply uses when under a load from the ColecoVision/ADAM, I attempted to get the answer for you. My 1500 watt pure sine wave power backup system from Cyperpower systems that cost around $800 has a built in Kill-a Watt meter that is real accurate. However, the problem is when I connect this power supply up to the kill-a Watt meter the load is too small to register. I even tried a different model of UPS power backup and still the same issue. I believe that for some reason the Cyberpower kill a watt meters only measure loads of somewhere between 10 to 1500 watts and well not measure a load under 10 watts. When I send 40 amps of current from the 12 volt rail to the -5 volts DC rail with a wire shorted across the two rails, for a fraction of a second the kill a watt meter in the Cyperpower systems UPS does jump up to 49 watts before the EVGA internal circuit breaker trips and shuts the power supply down. I have spent a lot of money on research and development this year for various projects, I might consider buying a self-contained kill a watt meter that measures 10 watts and below. I just have never had anyone ask that question before. So maybe I might get back to you in the future if I decide to buy a kill a watt meter that works under 10 watts. Since it appears my current ones only work between 10 to 1500 watts.
  5. The ideal regulated power supply should supply the same voltage when there is no load and when under a load. For example, there are some regulated 12 volt DC power supplies that output up to 5 amps that have a no load voltage of 12.33 volts DC and when under a load a 12.09 DC voltage or a full load voltage of around 12 volts DC exactly. Whereas an unregulated 12 volts DC power supply would have a no-load voltage of 14.97 volts DC and when under a load, around 12.67 volts DC (or somewhere between 15 volts and 12 volts depending on the load). Regulated power supplies are better quality and more expensive when compared to unregulated power supplies. The problem is the ColecoVision, ADAM, and even modern Windows style computers need power supplies that have 3 or more voltages which makes it harder for the power supply to maintain a regulated output for all 3 voltages. The ColecoVision and ADAM use -5 volts DC, 5 volts DC, and 12 volts DC. When a 3 output power supply is under a load sometimes the voltage can go up for some voltages and down for others. However as long as the voltage level is within 0.5 volts plus or minus of the original, then the power supply is a good power supply to use with the ColecoVision and ADAM as long as the current and wattage is strong enough to supply the load. For example the original Coleco brand ADAM power supply when connected to the ColecoVision with Expansion Module #3 while the Digital Data Drive is moving at high speed has a 11.56 volts DC, 4.91 volts DC, and -5.37 volts DC output. Therefore the EVGA doing 11.58 volts DC, 4.62 volts DC, and -5.20 volts DC is a little better then the original Coleco ADAM power supply. But we are talking about heavy loads. With very little loads one is looking at around 12.15 volts DC, 5.02 volts DC, and -5.12 volts DC with the EVGA power supply depending on the type of load that is connected.
  6. EVGA 500 Watt ATX power supply voltage levels with and without a load I just posted the voltage levels for the EVGA 100-W3-0500-K1 power supply with and without a load in the following thread. The reason I posted the voltage levels in the following thread, is so one can compare the voltage levels to eight other ColecoVision and ADAM power supplies. 500 Watt EVGA ATX power supply model number 100-W3-0500-K1 when connected to the ColecoVision and the Expansion module #3 ADAM computer (using special -5 volts DC add on module): No load voltage 12.20 volts DC, 5.16 volts DC, and -5.06 volts DC. When under a load 12.08 volts DC, 4.64 volts DC, and -5.15 volts DC. However when the Digital Data Drive is moving at high speed the following voltages were recorded 11.58 volts DC, 4.62 volts DC, and -5.20 volts DC.
  7. (nine) 500 Watt EVGA ATX power supply model number 100-W3-0500-K1 when connected to the ColecoVision and the Expansion module #3 ADAM computer (using special -5 volts DC add on module): No load voltage 12.20 volts DC, 5.16 volts DC, and -5.06 volts DC. When under a load 12.08 volts DC, 4.64 volts DC, and -5.15 volts DC. However when the Digital Data Drive is moving at high speed the following voltages were recorded 11.58 volts DC, 4.62 volts DC, and -5.20 volts DC. Here is the link to the thread that was created for the 500 Watt ColecoVision power supply using EVGA technology: 500 Watt Power Supply for The ColecoVision (New product released September 16th 2021) - ColecoVision / Adam - AtariAge Forums
  8. Around 8 years ago the PC industry decided to drop the legacy -5 volts DC from all new ATX power supplies (some people believe that one day -12 volt DC might also disappear but so far all ATX power supplies offer -12 volts DC for the Amiga and motherboards that require -12 volts DC). There was new self contained -5 volt DC regulators released in 2020 and 2021 that are super small and also are self-contained insulated with wire leads that attached directly to a wire harness. They cost twice as much since the older models require direct soldering to the circuit board. I well post more details in the future when I get a chance to spend several hours to half a day writing up a detailed post on how to make any modern ATX power supply work with the ColecoVision and ADAM computer. Its actually much easier to make a Amiga computer work with a ATX power supply since all one needs is the original or compatible Amiga wire harness since all ATX power supplies have -12 volts DC. Its more work to get a ATX power supply to work with the ColecoVision and ADAM because of the requirement to add -5 volts DC regulator to the wire harness.
  9. I am using a 1600 watt EVGA ATX power supply for my main PC that sometimes outputs only 80 watts, other times it outputs around 150 to 300 watts. Sometimes I can get the power supply to output over a 1,000 watts when my PC is under a heavy load. I went with a entry level 500 watt EVGA power supply for the ColecoVision and ADAM that only cost around $29.99 on sale. And it does a real good job of having stable voltages anywhere between 0.1 watts to 500 watts. I like ATX power supplies for use with the Amiga, ADAM, and ColecoVision. They have nice clean DC output regardless of the load size and they outperform all other consumer DC power supplies in performance. I well latter on try and take sometime and show people how to add a -5 volt DC regulator to any power supply that offers 12 volts DC. However, since a quality ATX power supply puts out a nice clean stable voltage, then the -5 volts DC regulator also offers a nice clean -0.3amps of current, but if one uses a non ATX power supply with a noisy 12 volts DC output then they well have to add some capacitors to the input voltage and output voltage of the -5 volts DC regulator to clean up the ripple and noise level.
  10. There is no more original 1983 to 1985 Coleco ADAM wire harnesses on the market for one to use to create a Coleco ADAM power supply. Also its getting very hard to find a female DB9 20 gauge serial cable on the market. In the worst case scenario if one day 20 gauge serial DB9 cables can no longer be purchased, then as a last resort one can use a high quality CAT8 ethernet cable that uses 22 gauge wire that is designed for power over ethernet applications in order to power ones Coleco ADAM. Basically one just uses a DB9 female to ethernet adapter plugged into the Adam memory console and then plugs in the 22 gauge CAT8 ethernet cable to the ADAM memory console. The other end of the CAT8 cable is then connected to a ATX power supply like the EVGA ATX power supply models. Then the ADAM computer is fully operational using CAT8 networking cable (22 gauge power over ethernet technology).
  11. Amazon and EBAY dealers are currently selling a new product called the 500 Watt Power Supply for the ColecoVision (price is around $129.99 plus shipping). Thanks to new technology developed in the year 2020 and the year 2021 by two different companies. It is now possible to add -5 Volts DC to any modern day ATX power supply (around 8 years ago all ATX power supply companies removed the -5 volts DC feature from their power supply). While DC switching regulators that are soldered directly to a circuit board have been around for many years, just recently in 2020 and 2021 two companies released a low cost DC regulator for under $10 that connects directly to any power supplies wire harness in order to offer instant -5 volts DC as long as the power supply can offer +12 volts DC output. What this means is that any power supply on the market that outputs +12 volts DC and +5 volts DC, one can now add – 5 volts DC for under $10 (around $6.23 + shipping). Also if one adds a high quality Schottky Rectifier Diode to the wire harness it well offer short circuit protection to the -5 volts DC add on module when connected to a good quality power supply like the EVGA. This also means that both the ColecoVision and Coleco ADAM now have almost an unlimited amount of power supplies to choose from on the market. As long as the power supply has both +12 volts DC and +5 volts DC, then - 5 volts DC can be added for under $10. So the most important thing to have now is the ColecoVision or ADAM compatible wire harness to make any ATX power supply become a ColecoVision or ADAM power supply. These new EVGA power supplies and all modern power supplies on the market offer automatic voltage input between 100-240 volts at 50 to 60Hz without any switches to change. Many years ago the old ATX power supplies one had to manually flip a switch to change from 120 to 220 volts, not any more since everything is now automatic for voltage regulation. Also EVGA fans are super quiet. The EVGA power supplies also offer excellent short circuit protection on all the rails like + 5 volts DC, and + 12 volts DC. Plus the method I use to connect the -5 volts DC add on regulator also offers perfect short circuit protection when the high quality Schottky Rectifier Diode is connected to the wire harness. This 500 watt ColecoVision power supply uses EVGA technology to offer outstanding short circuit protection on all the rails, over voltage protection, and over temperature protection. Over a 3 month period there was many weeks, days, and hours doing research and development for this project. It is a time consuming process to replace the wire harness with a ColecoVision wire harness, adding a -5 volts DC add on regulator, and adding a high quality Schottky Rectifier Diode. I hate to say it but it takes around 4 hours to convert one of these EVGA power supplies to a ColecoVision power supply (other 8 year old ATX power supplies that already have the -5 volts DC feature built in only takes 1 to 2 hours to convert). Therefore, for those that do not want to pay $129.99 for a 500 watt power supply that has been already converted. In a future post I well post information on how anyone with an electronics background can convert any EVGA ATX power supply that is purchased on sale for around $30-$35+ (or around $55 full price) to a high quality ColecoVision power supply. The catch is one has to have around 4 hours of time and the correct parts and tools to do the conversion (maybe some people can do the conversion in less then 4 hours, but if one moves too fast and makes a mistake something could be damaged). The picture quality is better with the EVGA power supply when compared to a Mean Well power supply. However the reference 550 watt Smurf power supply appears to still have the best picture quality since it uses a native -5 volts output instead of requiring a add on module. The good news is the ColecoVison and ADAM community now have an almost unlimited amount of power supplies to choose from. Any power supply that offers +12 volts DC and +5 volts DC well work with the new -5 volts DC add on regulator. There are plenty of ColecoVision wire harnesses on the market, however currently its hard to find a Coleco ADAM wire harness on the market. So the hardest and most valuable part of the power supply well be to have a Coleco compatible wire harness. Its getting late so in a future post I well post some more detail information on how to do the conversion of any ATX power supply to work on the ColecoVision. Attached in this post is a brief Microsoft Word instruction manual that ships with this 500 watt ATX power supply. 500 Watt ColecoVision Power Supply.docx
  12. Over the last 3 months I have been spending several weeks, days, and hours doing extensive tests on the new entry level EVGA non-modular ATX power supplies made in Taiwan and also the entry level EVGA fully modular power supplies made in Taiwan. While the quality of the Taiwan power supplies appears to be just as good as the ones that were made in China. EVGA engineered a different way on the new models that makes it harder to recover from short circuits (that engineering issue has nothing to do with where the power supplies are being made). The advantage of the 650 watt fully modular EVGA power supplies that were made in China many years ago (the power supply that is in the first post in this thread). Is that the old EVGA power supply after a short circuit one could recover from the short circuit with a flip of the on/off switch on the power supply. While the new entry level power supplies made in Taiwan have just as good of short circuit protection on all the rails when compared to the old models made in China. The problem is one must attach a momentary reset switch to the new models of EVGA power supplies in order to recover from a short, since a simple unplugging the power supply power cord or flipping the on off switch well not reset the power supply. While its true that desktop computer cases already have a momentary on/off reset switches. For my shorting experiments I needed to wire up a momentary reset switch so that the power supply recovers. The new EVGA power supplies from Taiwan have been shorted several hundred times, and they always recover once I press the external reset button I wired up. This power supply is good for an Amiga computer (ATX power supplies offer native +12, -12, +5, and + 3.3 volts DC). I have developed what some would call breakthrough techniques that converts any modern ATX power supply to offer -5 volts DC without needing any soldering or modifications to the circuit board. Basically, one converts 12 volts DC to -5 volts DC by using a add on DC regulator to the existing wire harness. Then one adds a special high current diode in order to offer short circuit protection for the add on -5 volts DC rail (Yes diodes do not work with negative voltages, but there are ways to get around that issue). The EVGA power supply already offers perfect short circuit protection on its built in +12, -12, and +5 volt rail. All one is doing is adding a device to the wire harness so the EVGA power supply can also do -5 volts DC while at the same time offering perfect short circuit protection to the -5 volts DC add on regulator. I have a lot of various projects going on right now, and if I have time in the future, I well share how to convert any modern ATX power supply on the market, so that it works with the ColecoVision or ADAM and some of the parts I used to do so. So, one ATX power supply could power the Amiga computer, and ADAM computer at the exact same time if one has the proper wire harness for both systems. Plus, if anyone wants to make a HDMI graphics card for the ColecoVision/ADAM there would be enough power to power a high-end custom HDMI graphics card (but I do not have any plans on making graphics cards, too busy with power supply projects and other various projects). One of the time stamp devices that I purchased is telling me its June 25th, so I am going to need to try to change that to September 5th 2021 (weird since it supposed to get its signal from a database that uses an atomic clock). It’s always good to have a UPS power backup system so when testing the Amiga or Adam computer the power does not go off to the computer on the test bench that is running 24 x 7. UPS power backup systems range in price between $50 to $60,000+ from Tripp Lite, Cyperpower systems and various other companies. With the average consumer buying UPS power backups under $1,000, and most of the time under $300 for the average consumer depending on how many watts they are trying to power during a power outage. The higher-end models produce a pure sine wave output when the power is off, where as the simulated sine wave UPS power backup are the entry level models for under $200. Sometimes when on sale a very low wattage entry level simulated sine wave model can be purchased for around $40. I currently use an entry level pure sine wave UPS power backup that cost around $250 for the work bench that I connect the Amiga and Adam too. For over two decades (over twenty years) I have been purchasing UPS power backup units from Cyberpower systems at least one every year for family members and I. Sometimes for the home computer, home theater system, and many various systems that need UPS power backups to protect against surges and brownouts. Some units I purchased for $40 each while others for around $700 over the last few decades. In the last 20+ years Cyberpower systems has always had their UPS power supplies made in China. I have some units that are around 20 years old. Sometimes they last 20 years other times they get a very bad surge from lighting issues and they last 7 years or less. But the attached equipment does not need replaced during power surges and brownouts. Anyways for 20+ years all the Cyberpower systems UPS power backups that I have purchased over the years have been made in an automated factory in China. To my surprise when I just recently ordered a UPS power backup from a Cyberpower reseller in August of 2021, this new unit was made in the Philippines. I did some research and its my understanding that Cyberpower systems has switched all their production from China to the Philippines. While the quality of the UPS power backups coming from the Philippines appears to be exactly the same as the quality of the UPS power backups that were made in China, I was somewhat surprised they moved production out of China. For various reasons many companies are moving production from China to other countries like Taiwan, Japan, Philippines, Vietnam, Mexico, and many other different countries around the world. For some consumer electronic categories, China use to supply 95% of the world with high quality products at a excellent price. While there are shortages in raw materials that are causing delays in products on the shelf. There is also another reason why its hard to get certain products and there is sometimes 6 month delays or more for certain products that consumers want and need. China use to make around 95% of certain products for the world, and when several companies decide to switch production to another country, many other countries are being flooded with orders that their automated factories cannot keep up. Some companies may have to move production back to China in order to keep up with supply and demand, or the factories in Taiwan, Philippines, and other countries may need to increase their output by expanding their factory size and run the factories 24 x 7 to keep up with demand for some products. There are still many companies that have a good relationship with China and they are not planning on switching production since China makes high quality products at excellent prices. It would be interesting to discuss why many companies around the world are switching their production from China to other countries. That would require an interview with the CEO’s of several different companies. Many people believe the COVID-19 pandemic is a naturally occurring virus in nature and that China is not responsible for the virus (other people would disagree). Many people grew up in a Republic or Democratic form of government and prefer that form of governmental system over communism. However, trading with China started occurring in the 90’s and got a big boost from President Clinton in the year 2000 when he signed a historic bill granting permanent normal trade relations with China. Back in October 10th 2000 Clinton signed the China Trade Bill into law which resulted in China providing most the electronic products and other products for the United States and rest of the world. As long as it remains legal to do business with China then some companies will continue to purchase from China since China makes high quality products at an excellent price. Some companies and individuals started purchasing from China back in 2019, since for the last 20 years almost everyone else was doing so. Now it has become unpopular to purchase products from China according to some people’s worldview. However, the United States government and many other countries still have a trade agreement with China which makes trading with China legal.
  13. I hope it works with a Laser printer directly or a wired Ethernet connection. I do not have WI-FI or BLuetooth, so if that is required I well not be able to use it.
  14. If a Coleco ADAM version is released in the future, I would be interested. However I would like a wired ethernet version since I am on a 100% wired 1GB home network. I do not use WI-FI or Bluetooth. https://fujinet.online/
  15. This is good news since its the only device in production on the market that powers the ColecoVision. Its good to see them ramp up production again.
  16. Your correct. I was thinking about 8MB and not 8Mb. Therefore this board is 1MB (0.95967MB). CharlesMouse should have called this board 1MB. Therefore the 2MB Micro Innovations Memory Expander released in the early 90’s is still the most powerful. It should be possible to make a 16MB or larger memory expander for the ADAM computer. Even a 64GB expander that used a superfast 64GB SDXC card could be developed with the advantage of the ability to hold the memory contents during a power off condition. Maybe because of lack of demand the 2MB memory expanders from Micro Innovations might be the biggest memory expanders every made for the ADAM computer. Convert Mb to MB - Conversion of Measurement Units (convertunits.com)
  17. Its my understanding that the biggest officially released memory expander for the Coleco ADAM computer is the 2MB expanders from Micro Innovations that was released in the early 90’s. While I like this post about a modern prototype 8MB memory expander for the ADAM, the reality is CharlesMouse last post at ATARIAGE was 3 years ago on June 27th 2019, therefore this 8MB memory expander for the ADAM computer well most likely remain a prototype and well never receive a official release. Which means the 90’s Micro Innovations 2MB expander remains the largest memory expander that was officially released for the ADAM computer.
  18. While its true that no USA dealer has the Col USB plug in stock. It appears that the Col USB plug is still in production. After many months of being out of stock, Dragon Box Shop just sent out a email notifying everyone that there is a total QTY of 339 Col USB plugs that are in stock now. Therefore if that is correct information, maybe some of the dealers around the world well try to import the Col USB plug to their country. In the past sometimes people had issues trying to get the COL USB plug imported in large QTY’s.
  19. Both Amazon and EBAY dealers have plenty of the 6.56 feet (200CM) custom power supply cables in stock (the one that was released on December 23rd 2019 in post #29). However, if the day comes where Amazon and EBAY dealers have to reorder this cable. Because of inflation and global supply issues the price would most likely have to be increased by around 20%. However, for now one can still get this cable for $12.99 with free shipping in the USA when ordering in QTY of 20. That is a good deal since that is around the exact same price that Amazon and EBAY dealers paid to get the cable imported into the United States. So the best deal on this cable is when ordering QTY of 20 at a time. I am glad a QTY of 500 were ordered back in 2019, since reordering the cable now would most likely be around 20% higher price and a possibility of not being able to get the cable at all because of global supply issues.
  20. Price increase coming on August 1st 2021 (most likely well occur) Because of inflation and worldwide supply issues most likely starting on August 1st 2021 or shortly after August 1st Amazon and EBAY dealers well increase the price of this 28.5 Watt ColecoVision compatible power supply and custom cable by 20%. So instead of paying $49.99 for the power supply on EBAY with bundled custom cable, on or shortly after August 1st the power supply well cost $59.99 plus shipping (Amazon $69.99 instead of $59.99). Also, the custom hard to get 25CM ColecoVision power cable well see a price increase from $15.99 to $19.99 plus shipping on EBAY (Amazon $25.99 instead of $20.99). Therefore, people have around a half a month to get their ColecoVision power supply before the 20% price increase well most likely occur. There is also a possibility that if the worldwide global supply problems continue that the current custom 25CM ColecoVision compatible power cord might be going out of production.
  21. XP Power PCM50UT03 works with the ColecoVision but the AEH45UM33 model is much better I finally got my XP Power PCM50UT03 power supply in after several months of waiting for the special order to arrive. This power supply cost around $115 after shipping. I wanted the PCM50UT03 power supply to be better quality when compared to the XP Power AEH45UM33 for around $85 after shipping, but under real world testing that is not always the case with products on the market. Both the PCM50UT03 and AEH45UM33 look exactly the same on the outside in terms of the exact same plastic case and cable used. But the differences stops there since the PCM50UT03 was engineered differently to obtain worldwide medical approvals, which results in different circuit board and component designs. The LED power light is dimmer on the PCM50UT03 versus a much brighter LED light on the AEH45UM33. The PCM50UT03 weight is slightly heavier at 1 pound and 4.2 oz, versus 1 pound and 3.4 oz for the AEH45UM33. While I realize the XP Power supplies like the PCM50UT03 are mainly used outside the United States where power supplies with level VI energy efficiency are not required, I was disappointed that the PCM50UT03 lacks the UL listed certification as you can see from the attached picture (UL listed is optional in the United States). It does have other certifications like CE safety for Europe. The XP Power PCM50UT03 has worldwide medical approval certifications. However, the AEH45UM33 does have the UL listed certification along with CE, and GS certification. I am very disappointed to report that the $85 AEH45UM33 power supply is much better quality when compared to the PCM50UT03 sample that I purchased. To my surprise the PCM50UT03 did not have as good of picture quality when compared to the AEH45UM33 when connected to the ColecoVision. Also, in a big disappointment when I shorted the XP Power PCM50UT03 power supply, the -5 volt DC rail never recovered, so this model of power supply has poor quality short circuit protection just like the Mean Well GP50A13A-R1B. However at least the PCM50UT03 +5 volts DC and +12 volts DC rail continued to work and the power supply was at least partially useable. But the ColecoVision needs -5 volts DC to work unless one internally modifies the ColecoVision so that it works without -5 volts DC like one ColecoVision I got off EBAY a long time ago. I then for around 60 minutes kept shorting the existing XP Power AEH45UM33 power supply that had already been shorted several hundreds of times in the past. The XP Power AEH45UM33 power supply is built like a tank and the power supply would not break. Therefore, for international customers the XP Power AEH45UM33 power supply is a perfect power supply to be used with ones ColecoVision/ADAM system since it offers the best picture quality and has perfect short circuit protection. However, the XP Power AEH45UM33 power supply since its not level VI energy efficient approved by the DOE, it cannot be sold in the United States for use with a consumer electronics device like the ColecoVision per the Department of Energy rules. The most expensive flagship power supplies are sometimes not the best power supplies. For example, both the Mean Well GP50A13A-R1B and XP Power PCM50UT03 have poor quality short circuit protection. But the lower priced Mean Well GP25B13A-R1B and the lower priced XP Power AEH45UM33 have excellent quality short circuit protection. On some ColecoVision systems the XP Power AEH45UM33 has a better picture quality when compared to the Mean Well GP25B13A-R1B. However only the Mean Well is level VI approved for United States consumer use. Therefore, if one lives outside the United States where level VI power supplies are not required the best ColecoVision power supply to use is the XP Power AEH45UM33. If one lives inside the United States where level VI power supplies are required since Feb 2016 per import laws then the Mean Well GP25B13A-R1B is the best power supply to use. Plus one needs to own the $15.99 25CM ColecoVision power cable to connect to each of the power supplies.
  22. EVGA makes the absolute best computer power supplies, some models like the top of the line EVGA SuperNOVA Titanium model 220-T2-1600-X1 has inflated in value to around $600. That power supply use to cost around $400, and it is made so well in the China automated factory that it can literally last up to 20+years running 24 x 7. Many people have EVGA power supplies and other high-end power supply brands that are over 10 years old and they run their computers 24 x 7 and never shut them off. Personally, I have not had to replace a power supply for over 10 years now. Oldest family members computer is around 13 years old and the computer runs 24 x 7. In the past EVGA power supplies, motherboards, and other computer equipment was always being made in a high-end automated robotic factory in China. However now 100% of EVGA production has been switched to Taiwan according to my sources. Just order any new model EVGA power supply or other EVGA product and you well see that it now says on the box made in Taiwan. It appears that the EVGA automated Taiwan factory is making the same quality power supplies and computer equipment as the China automated factory did. But I have not personally tested the new power supply models made in Taiwan, but the specs are around the same quality for the new models being made in Taiwan. I noticed that for various reasons some other companies around the world have also switched their production from China to Taiwan.
  23. Yes some classic computer and videogame systems use full bridge rectifiers that well convert AC voltage to DC and sometimes well allow a consumer to use either a AC or DC adapter to power the console. However, some videogame/computer systems like the TI-99/4a, Spectravideo, and other systems internal motherboard well be damaged or destroyed if one attempts to input DC voltage when AC voltage is required. The goal when selecting a power supply for the Mattel Intellivision II videogame system was to find a power supply that is as close to the original power supply as possible when compared to the Mattel Intellivision II videogame system power supply. In the 1980’s several computer/videogame systems used a low cost unregulated AC to AC power supply which was cheaper when compared to a unregulated DC to DC power supply or a regulated DC to DC power supply. However in the 21st Century since low cost high quality regulated DC to DC power supplies are the norm, they are now much cheaper in price when compared to a unregulated AC to AC power supply. Its hard to find a unregulated AC to AC power supply, however the TRIAD WAU160-750 AC to AC model when used with a 2.1mm female to 2.5mm male adapter plug is the best choice if the goal is to match the original Intellivision II power supply that was always a unregulated AC to AC model. Also when using a AC to DC power supply in place of a AC to AC power supply one needs to make sure that every single hardware version of the console included a full bridge rectifier. If in the rare chance early hardware versions of the motherboard did not include the full bridge rectifer then pluging in a AC to DC power supply would destroy the motherboard. Currently Digi-key has a QTY of 30 TRIAD WAU160-750 power supplies in stock at a price of $17.96 each. Also one needs to purchase a 2.1mm female to 2.5mm male adapter plug to use it with the Intellivision II videogame system. WAU160-750 Triad Magnetics | Power Supplies - External/Internal (Off-Board) | DigiKey
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