Trellot
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Posts posted by Trellot
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On 12/3/2021 at 4:56 PM, AtariSociety said:
I was gifted a Vader cased 2600. Does not work. I have a standard edition 4 switch Atari 2600 too.
Can I just swap the motherboards and it be a direct fit?
Or is the vader edition unique?
TJ
Other then the dark shell for the Vader system, the 4-switch boards should work interchangeably without issue.
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1 hour ago, x=usr(1536) said:
One of the main things he keeps an eye out for are people attempting to circumvent his one-POKEY-per-customer policy, or their prior addition to his 'do not sell to' list. The former is one quick way to get added to the latter.
I believe I made Brad's Lists that you mentioned as a result of, and I can only imagine this being the case, inquiring about the availability of goods for sale but then not making the purchase. I didn't make the purchase simply due to his claim that he was stupendously busy and had too many orders to ship until the end of the month, or some such detail. I needed them in a week for a birthday so I didn't order. Anyway, after that, all my subsequent e-mail purchase attempts with Best went unanswered; nothing in my SPAM folders. Once I figured out what I thought was going on, and not being one to marinate in frustration, I just gave him a quick call and he took my order....although the stuff did take one month to arrive, which I found entirely suspicious considering his relatively quick shipping methods and the fact that he only lives a couple hours + a few stone throws away from me
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You might try replacing the old switch box with an RF Adapter instead as seen below, so much better:
If that doesn't help, I'd verify +5v on the sound circuitry and, if good, there are a couple of 820pf polystyrene sound capacitors(C206, C207) on that circuit that can cause problems which you might try ordering and replacing:
On my system, interestingly enough, I shorted the L202 inductor on the schematic above and it literally corrected my static sound. Of course, my board had other issues, beyond the sound, during gameplay, on certain games, and ended up being resolved by a RIOT chip replacement.
Here is a field manual you can follow to determine issues with the 2600. Audio troubleshooting starts on page 121: http://www.robotsandcomputers.com/computers/manuals/atari2600_fsm.pdf
Good luck and I hope you can determine the fault.
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So your new Atari 2600 4-switch came with an AV-mod since you mentioned you swapped out the RCA cables? But then you mention that you are using the Atari branded switch box which suggest an RF setup? Are you connecting with the single RF cable, or are you using the the yellow, white and red cables?
Here's a similar issue I had myself and the action I took to resolve it. I believe just a replacement RF Modulator would have fixed the issue in my case:
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4 hours ago, Jonny swanny said:
Hmm. I’ll definitely have to give that a try. Thanks for reaching out!
Here's a link to my Atari 400, very similar issue, troubleshooting adventure. My debug steps turned up a bad OS ROM chip, A105, the bad chip, of which, was only verified/validated after swapping like 10 times between two Atari 400 systems. Good luck with your system.
~ Trellot
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Was thinking too, that it could be dirty, loose and glitchy Color/BW switch? Might try tapping the switch during game play to see if the colors glitch out. Just a thought anyway, good luck.
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I agree that Brad can run his business anyway he sees fit. However, I did run into a bit of a snafu with him once when, after I inquired about the stock availability on about 4 or 5 open-box 2600 titles, he told me that he was so busy and had already had more orders than could be shipped by the end of the month. Well, that told me I wouldn't get them in time since I needed them for a gift in a week, so I never officially made the order. Fast forward about 4-5 months and, and I'm trying to order something again...this time, however, there are no more responses to my email inquiries; and I mean I tried my work email, multiple home emails, etc. I also followed his email title instructions in order to avoid his SPAM filters from his end, and I never found one response from him in any of my SPAM boxes either, lol.
Anyway, I chalked it up to him being angry with me for not making that order months before and it dawned on me that he must have some elaborate methodology in place that notifies/warns him when that offending customer returns for more Atari!
At any rate, it didn't stop me. I just called him directly and made the order that way...he did take over a month to ship the items to me, which is extremely uncommon for him, while charging me right away. Still, no matter, I will continue to order from him in the future. I figure he has been at this for decades and his ways are set, well fine. Just have to learn his ways I suppose.
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Hey guys thanks for your points. So, I originally got the 5a fuse due to Bradley at Best recommending it. What exact fuse then are you fellas recommending then, 2a?
Thanks
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On 4/29/2020 at 2:26 PM, coleconut said:
Reopening an old thread, is it a 5A fuse?
Yes it is, I purchased a bag of Zephyr Fast Acting Axial 5x20mm 250V 5AMP fuses for future use. I already have another PSU that came with a unit with a blown fuse lol.
~ Trellot
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Afternoon everyone,
I've made a final determination of which chip is at fault after gathering the data for the table above. The A105 OS ROM chip for the 400_A system is bad. For Test #4 in the above table, I was able to get a passing set across two systems by swapping the A105 chips into each, however, repeating the swap test over and over resulted in the failure following chip A105 from Atari 400_A more often than not. With this data, I'll be placing an order in for a new one very soon.
Happy day to all,
~ Trellot
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Evening All,
Finally found some time to continue debugging what I started on this posting regarding a non-booting Atari 400 I purchased last year. Previously I was seeing a dark brownish screen at power up and we were able to narrow down the issue to potentially the OS ROM chips. Since my last posting, I was able to acquire another working Atari 400. Below is a table of results on some chip swapping I did to try to segment which chip is bad, or a combination of chips, etc. In the table each chip configuration, per test, is exactly the opposite of the other on each Atari system for clarity.
Note_1: 400_A = original failing system which prompted this post; 400_B is the new working system I recently acquired.
Note_2: In the table, when I declare a Pass what I mean is that the system boots to Memo Pad...i didn't have the keyboards installed to test for full functionality, FYI.
Observation_1: Notice Test #4 where, based on the chip configuration, I found two simultaneous passing configurations causing two working systems...this confuses me since, based on the table, and with all three original ROM chips installed into 400_A the system won't boot; one of the original ROM chips from the Atari 400_A system appears to be bad.
Observation_2: on the 400_A side, tests 5,6,7,8 seem to suggest that A105 is the culprit, but then see test #4 on the 400_B side and that chip passes when installed alone.
Observation_3: Also notice Test 2,3,4 from 400_B ... it shows a Pass when swapping one 400_A chip at a time into 400_B, effectively declaring all three chips as good...ugg?
Let me know if any of you have an insight into this data. Thank you!
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50 minutes ago, root42 said:
So my Vader is definitely having problems with its left difficulty switch. It doesn't work anymore, the B position doesn't have continuity anymore. I will try some contact cleaner, but if push comes to shove I would to replace it. Are there any compatible switches out there?
EDIT: Narrowed it down to about 300 switches on Mouser (through hole, ON-ON style). Now to find one that is 90° and has the correct dimensions and leg spacing...
A good cleaning and very slight rebending of the copper contacts for good connection should be all you need to do. However, you can purchases replacement switches from http://www.best-electronics-ca.com/ or http://www.myatari.com/ or maybe even www.console5.com.
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On 1/9/2020 at 9:22 AM, EpikalPuppy said:
As for your Vader unit, just know that in those, all of the chips were not socketed, they were actually soldered directly to the board. This makes repairing them a real pain. They do look very cool though.
Ah yes, like the one I ended up fully socketing....with iron and wick....since the bad IC wasn't found until the very last!
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6 hours ago, Mclaneinc said:
Must say that I still think the colour is way wrong, i'd hate to think there's a yellow 800 under that.
I admit this was my first reaction to the pictures as well. Something extra has been done to get that unit so white whether he did a famous job of retrobrighting or he painted it. That fact alone steers me far away from any thoughts of purchase since there should have been some kind of declaration in the description regarding it, imo. And if it is as Gunstar mentioned a lighting trick, then all the more wariness should be employed, lol!
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Might want to check back with that previous TIA chip to see whether or not you have two good chips now
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Regarding that second games pic, is that Pole Position? If so, there is definitely graphical corruption there, lol. Take a look, closely, at picture 3 of the solder-side of the board. Locate the RIOT chip (A202), first chip on the top, and notice what looks to be potential damage to two traces leading to pins 23 and 24. That might just be some mask coming off, or if say the board was dropped onto something there could be a potentially severed trace there. I'd run continuity on those traces just to rule them out, then move on to next steps.
~ Trellot
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What does the TV show? Snowy screen, solid black? Double check that your switches are cleaned up and making good contact. Try a different RF cable, etc.
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1 hour ago, bluejay said:
I decided to make the right choice and I bought a VIC 20. What are some good games for the vic 20?
Bahhhah! Try Jupiter Lander and Clown Attack!
I grew up with VIC 20, not a bad unit. All this mess and then a VIC 20 in the end, I love it!
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On 10/1/2019 at 1:59 PM, XeniaXMD said:
So I had problems with my 2600 so I decided to try my hand at the AV Mod. I did all the work, it doesn't look great but I hoped it would work, but it didn't. Is anyone able to see what I did wrong and if I can fix it?
That connection to C214 looks pretty wild
! I see the pad is gone for pin3 on the rf modulator pinout. Also, the greenish wire connected to the resistor looks to be touching the pad next to it; might just be the pic but good to double check that.
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21 hours ago, Nezgar said:
Sorry yes, I was assuming the cart would be plugged into a second real computer ... if the problem 400 was working, you could easily dump the OS ROM without even opening it.
Only the disk drive would need to be virtualized to facilitate transfering the saved dump to a modern PC via a virtial disk image. (SIO2PC-USB, SIO2SD, etc).
I guess main focus then would be to acquire a new personality and/or CPU board to try swapping out, or another working 400 to swap parts with for troubleshooting.
Thanks Nezgar, yeah I will try to acquire more working pieces for this troubleshooting. I like your neat trick here however! I will try it nonetheless once I have a working unit
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15 hours ago, Nezgar said:
- Boot DOS 2.5, Save Binary file: ROM1.ROM,A000,BFFF
Thank you for your comment. I'd very much like to try this process. I do have one cart that could be used, such as the one you pictured above.
Questions:
1. Can DOS 2.0 virtualization be used for this process?
2. How do I connect the ROM cart to the computer so that the OS sees it? I've dumped spis and such before but through a USB connection.
3. Lastly, as I'm thinking more about this, I feel like I might need a working Atari 400 for this? If so, I guess this test won't work for me yet, lol.
Thanks,
~ Trellot
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2 hours ago, _The Doctor__ said:
what were the values on the bad power supply? if it fed the wrong voltage on the 12 volt side... check the ram and support...
if it fed the wrong voltage on the 5 side check the os and other lsi's first...
The whole of clean reseat, make sure no bent pins/bad sockets joints thing still holds true... and change the order of the ram chips... sometimes a bad chip in a different slot is enough to get a machine partially working...
RAM almost always seems involved lately on the out of storage fix train though...
The bad power side board never even powered the LED, it was just dead, I couldn't get any voltage readings anywhere on the 400... it ended up causing my power supply to blow a fuse. I'll try the RAM swapping too. Thanks!
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17 hours ago, Nezgar said:
If you have another working Atari, you could swap the 24 pin OS ROM chips into a socketed brown-shell Atari cartidge (also 24 pins), and use DOS to save memory to disk, and analyze the file to see if the ROM contents show up, for each chip. (one 2K fp math chip, 8KB OS split into two 4K chips)
I'm not familiar with the process you're describing above although I understand the value of this test would be to show that the ROMs still dump some kind of data, is that right? So if I were to conduct this test then any data dumped would show the chip to be good? or would I need to compare my dump to some other known good dump out there? Thanks for your reply, btw!
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On 10/6/2019 at 6:36 AM, eegad said:
If you do manage to figure it out, I'd very much like to hear what you did. My first computer was a 400. Didn't touch it for over 30 years... When I got back into Atari stuff a dozen years ago or so, I only hooked up my 800xl, which replaced my 400 in 1984. Finally I decided to dig out and play a few cart games on the 400 one day a couple years ago. I got the same brown screen as you. Tried re-seating socketed chips on the board and such. Only thing that ultimately accomplished was getting different solid colors on screen... Very dark green, maybe maroon, instead of brown. One thing I will ask - does your 400 have a stock (Atari installed) RAM module? The one thing I did to my 400 back in the day was upgrade to a third party 32k module. When I was tinkering with my 400, I was wondering if the RAM was shoddy and was the culprit, but I don't have the original 16k module any more to test-swap.
Yes, I will post my findings as I go. Regarding my Atari unit, it does have the stock RAM module inside. I think my next step is to order new populated CPU/RAM boards and play the substitution game. Even if they don't solve my problem I'll at least have a good set for future repair projects.
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Atari 2600 Chip Swapping
in Atari 2600
Posted · Edited by Trellot
Any PICS would be great if possible
Sounds like a fun project!