What's new
By:
Filters

DARKSOFT CPS1 Multi - Support thread

Darksoft said:
No, it's possible that 4.8v is not enough and it's what is causing your problems.
Click to expand...
That's good I'm also worried about turning it up to high
I put it in another machine and measured 5.1v at the board powered on and had the same results so I was worried the low voltage had damaged it as it was tested working by the seller
I'll test again later and post more pics
 
If you measured 5.1v at the Jamma edge with the board powered, then it means that is not the problem.

Are you copying the files with a PC or a Mac?
 
Darksoft said:
If you measured 5.1v at the Jamma edge with the board powered, then it means that is not the problem.

Are you copying the files with a PC or a Mac?
Click to expand...
PC
Most games play fine just the a few that don't and the games that don't work were all tested working by seller I found a link to cps1 packs and tried the us set and euro world set and had the same problems with the same games
I didn't try the Japan rom set
 
For clarification, can you please provide pics how the jamma connector soldering/wires look like? Specially the power/ground wiring. As said already by nem, it looks somewhat shady and not good enough...
 
stt1 said:
For clarification, can you please provide pics how the jamma connector soldering/wires look like? Specially the power/ground wiring. As said already by nem, it looks somewhat shady and not good enough...
Click to expand...
Yip I'll take some pics I'm using a different harnesses to the previous one because it was getting voltage drop and my other machine does not
In saying that I've never had problems with that jamma harnesses before and had all sorts of boards running on it
 
Ok so i took a bunch of pics
first is the files on the sd card
20221103_171717.jpg
313493458_455610009974771_8382154626586003739_n.jpg
20221103_172125.jpg

then my jamma connector and voltage
20221103_172610.jpg
313493458_517614133567411_8944477658054128321_n.jpg
314020922_941544930151954_2163665108159793528_n.jpg

and pics of games some working some not
313818856_854289588916364_1822061874878781709_n.jpg
313872789_903077853996417_1561309569248933011_n.jpg
309863762_3209428509318622_4961231240105160593_n.jpg
313943220_887626375553360_7682517355706230470_n.jpg
 
jared mills said:
That's good I'm also worried about turning it up to high
I put it in another machine and measured 5.1v at the board powered on and had the same results so I was worried the low voltage had damaged it as it was tested working by the seller
I'll test again later and post more pics
Click to expand...
Different boards can require unique power supply settings.

You should adjust the power supply so that it is at 5.0 with the board running.

This is completely safe.

You will not find a 1 size fits all when it comes to tuning your power supply. Length of wire, gauge of wire, and the PCB itself will all have an impact on how you need to tune the power supply.

A single PCB setup will usually work with 5.1v with no PCB connected. But a multiple PCB setup (like Capcom) could require more; especially if you are powering it all with 1 wire for the 5v line.
 
GeorgeSpinner said:
Different boards can require unique power supply settings.

You should adjust the power supply so that it is at 5.0 with the board running.

This is completely safe.

You will not find a 1 size fits all when it comes to tuning your power supply. Length of wire, gauge of wire, and the PCB itself will all have an impact on how you need to tune the power supply.

A single PCB setup will usually work with 5.1v with no PCB connected. But a multiple PCB setup (like Capcom) could require more; especially if you are powering it all with 1 wire for the 5v line.
Click to expand...
What is the highest I can set it without damaging it?
 
jared mills said:
What is the highest I can set it without damaging it?
Click to expand...

Your board wants 5.000000 V on the 5V line, while it’s being powered. It powers all cpu and logic. You may get +/- 5% without much worry but that’s not really recommended. The word is tolerance. They can tolerate some variance either way but that has to do with parts, age, etc.

It’s the chips themselves that want 5.000v. There is even drop off between the jamma edge and the chip, but measuring at a chip is not always practical, so folks calibrate a teeny bit higher at the jamma edge and call it a day. That’s where your “5.1v” crew is coming from — measure at the edge as a proxy for what the chips see. But most of my boards don’t see a whole 0.1v drop from the edge to the farthest chip so I actually stay closer to like 5.03v at the edge. Occasionally I measure a chip in the center of the pcb if it’s easy.

Some boards of similar size have similar draw, so you can swap them without readjusting. But rule of thumb is to adjust your 5v line to 5v after changing each pcb.

Your 12V line is generally only running audio components that have way wider tolerance (like sometimes as low as 6v or as high as 18v!) so people don’t care as much.
 
Last edited:
The startup sequence in 1941 hangs if I flip the screen.

Wanted to play 1941, but my Dell monitor only rotates clockwise, so I set dip C5 = ON to flip the screen. When I do so, the picture flips, but it hangs in the startup sequence after CPS RAM BUFF 2 / OK. When I set C5 = OFF, it boots fine. Is this yet another issue with my dips? They seemed to read just fine in Carrier Airwing.
 
Last edited:
THCsoftcore said:
Turns out is my hardware. Trying to isolate to MB or C board at this stage. Will let you know what I find.
Click to expand...
Another CPS1 A board bites the dust. Custom appears to be fine and passes all ram checks, so perhaps it is a bad joint. New A board from my reserve and back in action.

This is the second A board I have had issues with this year. Lovely.
 
9999 Damage said:
The startup sequence in 1941 hangs if I flip the screen.

Wanted to play 1941, but my Dell monitor only rotates clockwise, so I set dip C5 = ON to flip the screen. When I do so, the picture flips, but it hangs in the startup sequence after CPS RAM BUFF 2 / OK. When I set C5 = OFF, it boots fine. Is this yet another issue with my dips? They seemed to read just fine in Carrier Airwing.
Click to expand...
Which 1941 ROM? I only have USA ROM on my multi.
 
GeorgeSpinner said:
Works fine, either way. I thought that went without saying.

My multi works, perfectly well, as far as I know.
Click to expand...
Oh, I misunderstood your prior post.

I've got a lead. I think C4 and C5 are bridged. I'm not really sure what "screen pause" is supposed to do, but C4 is screen pause in many games. It doesn't seem to affect test screens, and testing all-on and all-off didn't expose bridges, so no surprise that I didn't expose this issue previously. I'll check it out when I have a minute and report back.
 
You must log in or register to reply here.
Back
Top