The hardest (yet most satisfying) C64 repair I've ever done

Рет қаралды 6,164

2 ай бұрын

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🔗
C64 NORAMCHECK diagnostic: rasterirq.com/2022/04/c64-diagnostic-586220-without-ram-check/
Kinzi Dead Test and Check64: www.forum64.de/index.php?thread/94841-dead-test-rev-781220-update-002-bis-006/&postID=1890851#post1890851
C64 Keyboard test: csdb.dk/release/?id=98411
SID test: hackjunk.com/2017/11/07/commodore-64-sid-tester/
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🎞
0:00 Intro
1:07 On the inside
5:10 First power on
6:35 Finding faults without removing anything
12:53 Checking socketed chips
15:20 Isolating suspect chips
24:01 Back to one flash?
26:29 How to chase your tail
30:23 Color RAM bad?
32:49 Not color RAM?
36:13 Not done yet
41:01 Port and keyboard tests
42:55 SID full test
45:21 SID results
🎞
Thanks for watching!

Пікірлер: 36

@bmartin427 Ай бұрын

Maybe someone's power supply brick failed and fried all those chips at once?

@DJBJ24 Ай бұрын

Definitely plausible

@J0ermungand Ай бұрын

What a rollercoaster ride

@carraror Ай бұрын

I have just finished watching the video in its entirety. I just want to thank you for the HUGE work you put into editing it and to clarify all the moments. I learned a lot from it.

@RacerX- Ай бұрын

Wow! What a lot of faulty chips. What is amazing is that the SID survived since the 6581 is so prone to failure. Nice Work!

@drkamilz Ай бұрын

This is why we need chip replacement projects like ARMSID or Kawari.

@AusRadar Ай бұрын

"What the F....". Love it..

@adriansdigitalbasement Ай бұрын

I just started watching and I suspect after seeing the oscilloscope activity that you have a short between data line 7 and some other line on the system. Probably happened under one of those sockets when whoever owned this machine installed those sockets. I'm very curious to see what is the actual problem 😊

@adriansdigitalbasement Ай бұрын

Ah I was so wrong! That was a ton of bad chips, wow!!!

@retro_noix 2 ай бұрын

Great work in repairing this c64! SiD sound drunk at 46:00 😁

@jasongrimes9305 Ай бұрын

It's a haunted C64!!!

@taltechchip5827 Ай бұрын

Back to the past🔥

@jandjrandr 28 күн бұрын

I'm not surprised the ROMs failed with how poorly the system seems to have been treated. They are easily damaged if treated poorly. The PLA looks like it was already replaced with a more recent one so I expected that to work. The pin replacement on the 8701 clock IC looked dodgy, but the fact you had video means it likely was working. The other ICs being bad in weird ways was quite unexpected, but it seems like this system has been through the ringer... or washer and back? Fun to watch, but I'm sure it was quite the session of debugging.

@tomteiter7192 Ай бұрын

ooh... a missing ground will or course be the cause of a total random behavior!

@donpalmera Ай бұрын

"ground, ground, that's not ground" would make for a good tshirt.

@geehaf Ай бұрын

Great work and result!

@carraror 2 ай бұрын

I appreciate that you thoroughly explained your troubleshooting mental process

@borayurt66 2 ай бұрын

Nice, a disaster which managed to kill 2 CIA's, ROM IC's but the SID and the PLA survives, that's a first for me. And a quick question, what id that transistor looking mod on the ArmSID?

@TheRetroChannel 2 ай бұрын

It's a 3.3V regulator, I managed to kill the original one on the armsid putting it in a pla socket.

@tomteiter7192 Ай бұрын

an actual useful testing mode for a test cart would actually be just toggling a selected address line every 500ms, same for a selected data line, so that you could "relaxedly" check the logic levels for each line with a oscilloscope... Maybe that would only be possible with some sort of test module that replaces the 6502...

@TheRetroChannel Ай бұрын

That would be nice, but yeah not sure if it's possible. You'd probably need to get the VIC-II to "agree" to such a thing

@theEIGHTBitBox Ай бұрын

Very good fault diagnosis! Thank you for the very good insight into how far a repair really can go!

@m4rgin4l Ай бұрын

That is one cursed C=64.

@gertsy2000 Ай бұрын

What a journey!

@wimwiddershins 2 ай бұрын

Great video mate. Tons of dead chips.

@tspawn35 Ай бұрын

Wow, a rev 425 board that doesn't have all the big IC's socketed from factory that's different. I thought commodore only went back to soldiering the IC's with the rev 466 they made after the 425 as a cost reduced long board model.

@BarnokRetro Ай бұрын

Great video! What a conglomeration of faulty chips. Great job troubleshooting along the way. I'm pretty sure I don't want to know how much time you invested in that board. :D