32bit Commodore Amiga Repair-a-thon - Part 4 (A1200 x 4)
Вставка
- Опубліковано 18 січ 2025
- If you would like to support the channel via Patreon (keep the channel running) - / gadgetuk164
You can also buy me a coffee or donate via Ko-fi - much appreciated! ko-fi.com/gadg...
This time a super short video - finishing off the A1200 boards!
Thanks to Stefan Skotte and Raj for providing these for repair!
Part 3 (4 x A1200) - • 32bit Commodore Amiga ...
Part 2 (2 x A4000) - • 32bit Commodore Amiga ...
Part 1 (2 x A4000) - • 32bit Commodore Amiga ...
#commodore #amiga #repair
![Road Rash - The Legendary Combat Racer [ PC Gameplay ]](http://i.ytimg.com/vi/XXFQsW8MS3I/mqdefault.jpg)
The cat is coll 🐱
I would love to watch some more difficult repairs like these (well, they can be easy for your) on some forgotten A1200's boards ;). I love when it's isn't easy to fix a board, and you do it awesome in every single video. These boards are becoming more and more expensive nowadays and making one alive from time to time is wonderful, but they need your knowledge.
Great work - nice video : )
If I remember correctly, and as I have an Escom A1200 with this fix, Escom boards have a wire from DF1 to DF0 connector to bring READY signal because Escom boards DF0 connector lack this crucial signal (or it is Disk Change).
Just find the info on the SPS site : www.softpres.org/article:hard:fixing_the_amiga_technologies_a1200_fdd_connector
Ha, just see you talk about this later on the video :-]
Nice work! PLCC chips I find its far easier to just tin all the pads, flux everything of course and just cinch the chip in with hot air. Also give Rosa a hug for me.
Wow, you made soldering that video DAC look so easy... :P
I am also hopeful that RetroBench makes a comeback, I've ordered a few cap kits from them in the past and they are definitely quality.
It's late on Sunday night, need to work tomorrow so I should go to bed, but of course I'd rather watch you struggle (and win) with that A1200!
Hope you feel better soon!
Thanks! =D
Epic repairs Chris. 👍
Cheers =D
The cat really helped to pass the RAM test.
Reminds me of my parrot. Whenever I'm watching TV and he wants attention, he parks right in the middle of the screen.
🤣🤣🤣
Interrupt mask is a CPU-level thing AIUI. If they’re disabled the only one that could get through is level 7: the non-maskable interrupt. All three IPL lines would have to be low. Unsure what DiagROM does with an NMI. Probably not very much. But if it’s constantly interrupting? I’m not sure if you’d get nothing executing, or if you’d only get one command executing per N cycles, or if it’d ignore it after the first unacknowledged interrupt. It sounds more like a floating Halt line to me, but you did say that was tested. Odd, I agree.
Yes, I think perhaps Paula was outputting all lows on the IPL lines. The halt line couldnt have been the issue, since swapping Paula resolved it and I dont believe Paula connects there. Halt was also probed and scoped many times.
Nice relaxing fix series. Thanks.
As for replacing traces using epoxy, I've tried and it does exactly what you say it does. Far more trouble than it's worth. That, and there doesn't seem to be anything wrong with your repairs as is.
As for Rosa ignoring you, she wasn't. She was only turning a deaf ear to you, she can't be blamed. :)
Yeah, it just doesnt work very well. RetroGameModz used some special epoxy I think that worked up to 400 degress or something - that might do the job! LOL @ Rosa =D
@@GadgetUK164 That man is an artiste. An annoying one at times, but an artiste nonetheless. I did some research a couple of years ago on high-temp epoxies and found the Masterbond epoxy at that time. I never followed up on it.
www.masterbond.com/tds/ep17ht (Which is a one-part system that has to be baked at 300F-350F for 2-12 hours). You will have to request a data sheet. Bah, no thanks. And their epoxy appears to have a 3 month shelf life. Another minus for guys like us.
So you prodded me to revisit the topic today and I found another 600F+ epoxy that might work:
www.cotronics.com/vo/cotr/pdf/4460.pdf (Duralco 4460, Which is a two-part system). Data sheet: www.cotronics.com/vo/cotr/pdf/4460.pdf
Here is a page of epoxy recommendations where I found the Cotronics epoxy (as well as a reference to the Masterbond epoxy):
staff.washington.edu/wbeaty/chem-epoxy.html
Personally, I would try the Cotronics epoxy first, just to avoid the baking process if nothing else.
The "baking" process on a populated board could be as simple as running current through the patched trace to cure it in place. Meaning no need to heat the entire board. But, nah.
Another great fix, nice work! Hope your health issues get sorted soon. Have a great one!
Thanks =D
Loving your determination in this video with the board from hell. I knew you couldn't resist trying to fix lol
Thanks lol =D
GREAT VIDEO M8 . THE ISSUE IS CLEARLY SHARON LOL :P
Part 3 (4 x A1200) - ua-cam.com/video/EE6dmgqOApo/v-deo.html
Part 2 (2 x A4000) - ua-cam.com/video/oXhHH5HpU4Y/v-deo.html
Part 1 (2 x A4000) - ua-cam.com/video/rcPArDk-GtE/v-deo.html
Oh, and regarding the screen mess when booting from the external floppy - could that be a resolution change issue? You’ve had to go through an extra interface in 80 column mode to choose the external floppy. Perhaps that particular game doesn’t set its resolution properly and relies on being in a lower res at startup?
Nice idea - it could be that! I never thought about that!
Absolutely fantastic video very interesting indeed you cat had both myself and my wife laughing 😂 can I ask what happened to her ear
Thanks, super appreciated =D Rosa had a small lump appear on her ear. The lump was removed and it was a tumour. For safety they suggested removing the ear, as its common for the lump to come back and spread. That was around 5 years ago and she's still OK, so it did work.
@@GadgetUK164 I’m so glad she’s ok mate after watching your videos I’ve decided to get an old oscilloscope soooo is there anyway you could see yourself clear to do an how to Series on how to use an oscilloscope to fault find please
YES!!! More pokage!!! ❤️ lol
Chris it's been a while you retro Legend! ha-ha That was some great! detective & soldering work as always. BTW there is no Patreon or Coffee links in description 🖖👍
Thanks =D I usually add them just as it goes public =D
I don't get ads on youtube... ;)
Well, she’s a cat, and she heard you had a mouse... 🐈⬛
LOL!!!!
@Gadget I was looking at that Blue Cap near the Paula and thinking that cap looks a bit suspect and then a screen message appears. Are you reading my mind or something?! 😉 Add a second channel with more cats! 😁
🤣🤣 Yeah, I didnt kapton tape the caps off as I had new ones sat there waiting to go on later =D
@GadgetUK164 I have a black screen A1200 that I bought not working from Ebay and is driving me mad, there were blown bits replaced and the XU9 GAL was duff, I replaced that but now all I get is a warm chipset and stone cold roms. Any ideas?
Does DiagROM give you any clues? If DiagROM is not booting you need to look at the databus, address bus, ROM OE, RAM OE / WE lines etc and try and work out if there's a databus problem or perhaps an address decoding problem. You could divide and conquer with DiagROM by removing Paula, and both CIAs. If the menu then appears, it's one of those 3 IC's causing your problem.