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Official: CPS1 (CPS1.5) Multi by Darksoft/Apocalypse - Interest Check Thread

this project is supposed to be an effort in preservation. Please, folks, if you arent highly skilled in soldering and modification, c board manipulation and b-21 desolder/solder is not the place to start. Trying to save a few dollars doing it yourself, if you dont have the experience to do so, will cost much more in the long run, to you and to the collector community. [/end soapbox speech]
 
Bigsingerdawg said:
jassin000 said:
IF you are transplanting a B21 chip you are going to need experience with hot air rework and SMD based soldering (yea that shit is HARD/deal-breaker for 90% I'd say).
Click to expand...
Doctors what is my prognosis?
Paging dr @jassin000 and other learned doctors

Tell it like it is
Click to expand...
That one has the good chip, but uses no battery.

Maybe someone else can confirm, off the top of my head, to convert that one, you need to:
45/46 to Vcc = default keys
45/46 to gnd = battery powered
 
Darksoft said:
Bigsingerdawg said:
jassin000 said:
IF you are transplanting a B21 chip you are going to need experience with hot air rework and SMD based soldering (yea that shit is HARD/deal-breaker for 90% I'd say).
Click to expand...
Doctors what is my prognosis?Paging dr @jassin000 and other learned doctors

Tell it like it is
Click to expand...
That one has the good chip, but uses no battery.
Maybe someone else can confirm, off the top of my head, to convert that one, you need to:
45/46 to Vcc = default keys
45/46 to gnd = battery powered
Click to expand...
You are right, it is discussed here: https://www.arcade-projects.com/for...oard-to-work-like-a-90631c-5-battery-b.13116/
 
Darksoft said:
YesAffinity said:
this project is supposed to be an effort in preservation.
Click to expand...
That's our ultimate goal. To come with a perfect reproduction of the C board.
Click to expand...
This would be great! Having a more non-destructive solution would be better in the long run. Less botched installs, less service support and cheaper cost for a majority of buyers (not having to send away your boards and pay someone to transplant surface mount chips).
the current multi’s are great for this. Take the Taito F3 or Sega 16B. You can reverse this installation cleanly and you’re not destroying the original hardware to get them installed.
 
Darksoft said:
Bigsingerdawg said:
jassin000 said:
IF you are transplanting a B21 chip you are going to need experience with hot air rework and SMD based soldering (yea that shit is HARD/deal-breaker for 90% I'd say).
Click to expand...
Doctors what is my prognosis?Paging dr @jassin000 and other learned doctors

Tell it like it is
Click to expand...
That one has the good chip, but uses no battery.
Maybe someone else can confirm, off the top of my head, to convert that one, you need to:
45/46 to Vcc = default keys
45/46 to gnd = battery powered


Thanks for having a look @Darksoft and commenting @sergiopolog



So from that thread,

[*]
[*]Pin 42: lift up and connect to CN19 (pin to program keys)
[*]Pin 44: lift up and connect to CN20 (pin to program keys)
[*]Pins 45 and 46: lift up and connect to GND (solder blob along Pin 47 for example, in order to set B-21 works in "battery mode")
[*]
[*]So if I get some soldering help from someone who can do the above and I would be good? I'm not in the 90% of people can't do hot air situation?
[*]
[*]Ie: I don't need to go buy another game for a better C board we think? Appreciate the guidance.
[*]
[*]Happy to send someone my board for testing if it they have the parts and ability and it would be useful...and would also result in a properly installed multi (wouldn't do it myself) at the end :) .
[*]
Click to expand...
 
I just got my cps1 in the mail. It has a B-17, am I sol because it's not a b-21?
 

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You NEED (at minimum) a B21 based C-board (and a battery backed C-board to be specific but normal B21 can be converted) to use the multi yes.
 
Darksoft said:
Dont draw any conclussions yet. We can still change a couple of things....Just keep coming your thoughts...
Click to expand...
jassin000 said:
You NEED (at minimum) a B21 based C-board (and a battery backed C-board to be specific but normal B21 can be converted) to use the multi yes.
Click to expand...
I figured as much but just wanted to double check. Ill keep my hopes up on a more varied solution from DS but I have a B-17 for trade until then lol.
 
So by not having this b-21 chip the board is unable to play 1.5 games yet to not include it means the board is considered tampering with official hardware? I would like it if the kit was easy to install like the other multis while retaining the legitimacy in submitting scores to online bookkeeping websites like Twin Galaxies. I know that seems a no brainer and what your aiming for. If all else fails I would much rather a non official b-21 solution that prevents the salvaging of other boards chips.
 
Kavas said:
So by not having this b-21 chip the board is unable to play 1.5 games yet to not include it means the board is considered tampering with official hardware?
Click to expand...
you're confused my friend.

All original CPS1 games (both normal CPS1 and CPS1.5) have a small PCB at the top called a C-Board, this C-Board has a large custom chip on it that manages the graphics for the games, this chip is also used for security to prevent piracy.

When the CPS1 first came out every game had a unique chip, but then at some point Capcom made the "B-21" version of the chip which was a "universal" chip. what made it universal was that it could be programmed uniquely for each game instead of having to make a whole new chip for each game. the down-side was that it needed a battery to store this programming (or maybe it was by design to protect it? I don't know).

The Multi DOES NOT replace this C-Board, and further it needs this "universal" C-Board so that the multi can program it differently every time you switch games.

It might be possible to make a version of the multi that emulates the function of the C-Board but some people believe that makes it less authentic since if you do that you're notjust just swapping games but emulating parts of the hardware as well.
 
Is it safe to assume seeing this is a B-21 that this would be suitable in the current setup?
B-21.png
 
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