CPS-1 board identification - Final Fight

[RetroReboots]

Hi,

I took a gamble and ordered a Final Fight CPS board stack from AliExpress...I know, I know. However, it was fairly cheap and I'd ordered a SF2CE one before which turned out ok in the end. Anyway, having tried it I've noticed some vertical lines in the video, I've yet to clean the contacts/reseat the chips so I'll definitely try that first. The main question I have is what have I got here? It looks to me like some sort of hacked together capcom boards with Final Fight roms.

A board - 89626A-4
B board - 91635B-2
C board - 92641C-1

Non of these seem like final fight board numbers, I could be wrong. Does anybody have the final fight boards, what are your board numbers?

The A board, looks like it could be a CPS 1.5 board, it's missing the audio amp and has had one added, sound is a bit off but can't quite put my finger on what's wrong with it.

The B board seems to be from a different game, like Cadillacs and dinosaurs, I thought that the final fight board should be 89625B-1? Is it common for these boards to be repurposed?

The C board looks like it previously had a battery, it's been removed and hacked to bypass it. It has the CPS-B-21 chip. I understand why pins 45 and 46 are cut/wired to +5v as part of this mod but does anyone know why pins 41-44 are soldered together?

Feel like it might just be easy for me to return this, feel like I have a Frankenstein Final Fight here!

Sorry, I meant to post this thread in the Capcom CPS1 sub thread folder, but not sure how to move it now.

 

[ekorz]

You have a repurposed CPS1.5 A board, repopulated with cheap parts to enable jamma audio.
You have a converted B board from who-knows-what game but it doesn't matter really.
You have a C board that has had a battery removal and a key bypass, so that the converted B board code runs without the normal Final Fight security key.
The pins 42,43,44 are for security, and 41 is ground. There's probably a trace cut there too.
More info here: https://gitlab.com/loic.petit/cps2-reverse/-/tree/master/DLs/DL-0921
Here's some more discussion: https://www.arcade-projects.com/threads/let’s-talk-about-the-flood-of-chinese-cps-1-conversions-on-ebay.17026/

 

[RetroReboots]

You have a repurposed CPS1.5 A board, repopulated with cheap parts to enable jamma audio.
You have a converted B board from who-knows-what game but it doesn't matter really.
You have a C board that has had a battery removal and a key bypass, so that the converted B board code runs without the normal Final Fight security key.
The pins 42,43,44 are for security, and 41 is ground. There's probably a trace cut there too.
More info here: https://gitlab.com/loic.petit/cps2-reverse/-/tree/master/DLs/DL-0921
Here's some more discussion: https://www.arcade-projects.com/threads/let’s-talk-about-the-flood-of-chinese-cps-1-conversions-on-ebay.17026/

Thanks, and thank you for the links