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CPS1 Board Repair (B21 / DL-0921 chips in plentiful supply)

Cool- are these replacements for the "C" board or the "A" board? I can't check until I get home, but I don't recall seeing CPS B-21 stamped on those chips on the "A" boards. Thought it was something else. . . .
 
No doubt- I have had a ton of CPS1 boards over the years and almost all of my problems were the damn "A" board. We need those replacements. I don't suppose it would as easy as taking say a B-05 "C" board or any other number for that matter and replacing it with one of those B-21's and have the board behave as a B-21? That's above my expertise to know. . .
 
I have a couple that I thought about just tossing in the garbage bin. This is good news :)
 
-Ace- said:
No doubt- I have had a ton of CPS1 boards over the years and almost all of my problems were the damn "A" board. We need those replacements. I don't suppose it would as easy as taking say a B-05 "C" board or any other number for that matter and replacing it with one of those B-21's and have the board behave as a B-21? That's above my expertise to know. . .
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It can be done but the wiring is different. But if you have a failed B-21 C board this will replace that chip or potentially the C boards can now be reproduced

The C board customs do fail, though nowhere near as often as the A. I'm still not going to look a gift horse in the mouth, this is enough C customs to keep CPS1 and 1.5 going for a very very long time
 
undamned said:
Arcade Hacker recently posted up that he found a nice supply of new old stock B21 / DL-0921 chips. He even ordered some and verified that they are legit:

http://arcadehacker.blogspot.com/2018/12/capcom-cps1-b21-chips-in-wild.html

Maybe this will help keep some A boards out of the trash?
-ud
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Only useful for CPS1 C-boards and CPS2 A-boards. However I bought few old stocks of CPS-A-01 last year (or was it 2 years ago?): one supplier had 7 units and an other one 8 units, both were really cheap (between $5 and $7 a pop) but then other suppliers were much more expensive.
I posted about it on a French forum.

[EDIT]
It was 2 years ago:
http://www.neo-arcadia.com/forum/viewtopic.php?f=9&t=56710&start=50
At the time suppliers I found also had CPS-B-21 and other B chips.

An other example on how poorly information circulates in the arcade world, even Eduardo is 2 years late... :(
 
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@Apocalypse sort of related: would you happen to know where I can get my hands on a good 86S105 ? Is there anyone carrying them like this custom?

I've got a 1943 board with bad ship sprites, and narrowed it down to the custom sprites generator.
 
xodaraP said:
These are replacement chips for the C board, not the A. But certainly a great find! Here's hoping there's a similar find of A customs!
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See post n°10 :)
opt2not said:
@Apocalypse sort of related: would you happen to know where I can get my hands on a good 86S105 ? Is there anyone carrying them like this custom?

I've got a 1943 board with bad ship sprites, and narrowed it down to the custom sprites generator.
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Ah ah, it's an other of my nightmare chips, fails so often. Sorry but no I don't have any alternative for those (but do have a pile of boards in need of a replacement chip).
 
Apocalypse said:
Ah ah, it's an other of my nightmare chips, fails so often. Sorry but no I don't have any alternative for those (but do have a pile of boards in need of a replacement chip).
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I guess I'll just have to find a cheap donor board. Maybe one of those pre-cps1 mahjong games. lol!
 
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