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Found 5 results

  1. I picked up an NTSC 600XL off eBay a few weeks ago and have finished stage one of the upgrades, including replacing the channel 2-3 selector switch with a 5 pin DIN video port and UAV, and upgrading it to 64K. The next step will be installing an Ultimate 1M board. Mostly things have been successful. The one problem I am seeing is that when I turn it off, if I don't wait around 15 seconds before turning it back on the computer will lock and not reboot. If I power cycle it quickly, the old program will remain at least partially in memory (at least screen RAM) and I can see the previous screen on the display. When cleanly booted, everything seems to work properly. For the RAM upgrade I used 41464-10 DRAM chips. Any ideas what could cause this issue and what can be done to correct it?
  2. Hi Guys, I need some help, please... I recently bought a 600XL off of eBay, picked it up tested it - all working. Then opened it and found to my delight that all the chips were socketed! A hardware project in the making. First things first - upgrade to 64k. I tried bending a pin on the IC living at U5 and broke the off - the IC can be replaced, right? So, two questions from this (slightly less than competent) amateur modder... 1) I need to replace the IC at U5... is there any difference between an 74LS158 and a 74LS158N IC? 2) If I do this upgrade can I not upgrade the memory futher - i.e. if want an ultimate 1Mb or similar do I a) have to reverse the 64k upgrade, b) leave it in, it's necessary, or c) nope this is the only memory upgrade for a 600xl? Cheers!
  3. Hi all. I’m new as an official forum member but I’ve been a lurker off and on for a few years. I’ve been into ColecoVision with my father since I was a snot-nosed kid back in the early 80’s. Anyway, I am looking for a few cartridges to help my father improve his Coleco-ADAM collection. Here is what I’d like to find first (loose carts are fine, prefer label intact, normal wear is fine): Artillery Duel Bc's Quest for Tires Bump n Jump Choplifter Jumpman Junior Pitstop Time Pilot Antarctic Adventure Boulder Dash Centipede Congo Bongo Defender Galaxian Hero Jungle Hunt Lady Bug Miner 2049 Montezuma's Revenge Oils Well Roc'n Rope Root Beer Tapper Super Cross Force Mr. Do's Castle One-on-One (Dr. J & Larry Bird) Pitfall 2 Quest for Quintana Roo Star Wars Super Action Football Super Cobra The Heist Tutankham We have them all on SD multi-cart and as of two weeks ago, Bob S’s IDE flash drive, but nothing beats the nostalgia of playing from an actual cartridge. If you have any of these that you’d like to sell, please PM me with your asking price. I am also looking for an ADAM memory expander card (any size), ADAM digital tape drive and ADAMnet 3.5' Micro Innovations disk drive. I know it's a longshot on the MI drive but wanted to throw it out there anyway. Thanks, Justin Omaha, NE
  4. So I'm working on a 2600 game and when it's done I'd like to put it on a cartridge, but I want to build it myself and I've run into a few questions. 1. I've been looking around at EPROM, EEPROM, and flash EEPROM and have found that flash looks like the best option, but can I even put a 2600 game on flash EEPROM? 2. The flash module I've found is a 32 pin PDIP package and is 256kB ( http://www.digikey.com/product-detail/en/SST39SF020A-70-4C-PHE/SST39SF020A-70-4C-PHE-ND/2297831 ), my target size is 64kB, will it be a problem if I use a chip that size? 3. I've seen a lot online about programming flash EEPROM, but most of the ones I've seen have been for a different style chip with what looks like a single I/O 8 pin chips as a posed to the multiple I/O many pin arraignment you find on atari games, what is the best way to program the chip I want to use? 4. How do you program the 22v10 chip and is this one a good choice? http://www.digikey.com/product-detail/en/ATF22V10C-15PU/ATF22V10C-15PU-ND/1008580 5. What would be required to build a cart which is compatible with DPC+, right now I'm developing the game without it as I fear it might be too complicated, but I though I'd ask anyway. 6. Is there an actual step by step on building an atari cartridge? I'm no stranger to electronics, but I've dealt mostly with micro controllers and simple circuits and this is a bit out of my experience. I would really appreciate an answer to any or all of these questions. Thanks in advance!
  5. I've been thinking a little, and I think it would be fairly easy to build a RAM board for the atari 400/800 which would occupy the first RAM slot, have a ribbon cable run out to the 74LS42 address decoder, and provide 64K of RAM and the XL OS to the board. I think there would NOT need to be many soldered modifications, maybe to add a hard reset (or just modify the OS to detect the 400/800 NMI style reset). I would do my best to include a way to enable and disable the upgrade, so you can return to 400/800 mode and have all 4 joystick ports available for use, etc. The main purpose for this upgrade would be to put a U1MB into a 400 or 800, and plug it into this board. The existence of an MMU socket, a 28 pin style OSROM socket, and all of the other necesary signals pinned out for the U1MB (with the exception of /HALT which would require a connection to the CPU board I believe) would make the installation all but plug and play since all 400/800's are socketed. The only non-plug and play bit would be the soldered connection to /HALT on the ANTIC, I believe. In addition to providing U1MB connections, this upgrade could be used standalone as a 64K upgrade, just use an OSROM (would be provided) and an MMU (would probably be present on the board as a CPLD) and it works by itself. I was thinking I would do my best to keep the price below $50, though I suspect it'd be cheaper even (the concept itself isn't all that complex IMO, so I'd estimate $30 at the least). Of course, this is only checking interest, I'm not saying I will do this in quantity just yet, or that everything I said is even correct/that the concept is totally viable. EDIT: also, I know that the incognito is basically U1MB + SIDE converted for the 800. I know there are subtle differences in the software, like the U1MB stuff using a different key in place of help on the incognito. To that effect, hopefully Candle will helpful in this regard, and allow me to make some small changes to the U1MB firmware image to allow easy use with this board, which would have to be flashed into the U1MB once installed. I know this seems a lot like incognito, but the difference is that it also supports the 400. That was my original plan, to make it for the 400, but there's no reason it couldn't work in an 800, so I might as well support it. I don't mean this to compete with incognito, I want to make that clear. EDIT2: typo, there will NOT need to be many soldered modifications EDIT3: 400/800 use 74LS42 as address decoder, not 74LS138.
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