Lucky me I'm in possession of a PU-8 board that has the extra space a second oscillator. Would anyone possibly have an NTSC oscillator they would be willing to sell?

It's the 53.69Mhz oscillator if I'm not mistaken.

May consider an entire board or system.

Looking for the Nichicon PSU that was in the 5000 series and above.

I take it these are old photos so we can see how you attempted to perform this mod, but I don't see any resistors and I don't see a single pole double throw (SPDT) switch anywhere still. Do you know how to read an electronics schematic? I am also quite surprised that you did not rip up more than on...

So i thought i'd post a bit of a build log on my experiences doing this. I started simply by removing the BIOS ROM from the SCPH-9002 which was less painful than i thought it would be. https://i.imgur.com/A5uTtMRs.jpg I then started to dissassemble the SCPH-5502 which did not go down without a bit o...

Ahh i see, well after some pain staking soldering i JUST got the 9002 BIOS working in the 5502 i'll leave the dual bios stuff for another weekend haha.

Here you go:


Not the prettiest job, used some cut up resistor legs to join a few of the pins. Not so bad that it shouldn't work IMO anyway

So i've checked that pin 28 connects to pin 140 on the CPU, so i've fixed that. Even when i have the CE pin for the original BIOS connected i still get nothing. So im out of ideas here, would anyone be able to help please?

So i got it all installed and... wait for it... Yeah nothing lol

I did accidentally lift pad 28 under the original bios :\ so i suspect my "fix" for that is the cause

Will keep investigating!

aww no magic smoke

Thought so, should be pretty simple then hard part will be soldering it. So your tempting me now what exactly happens if i switch it when the CPU is on xD i know it will be bad but what!?

Well looking over it again, the CE pin is the only one i'll need to touch really. It gets 3.3V but also connects to something else right? or does it just connect straight to the CPU? If thats the case and it connects to the CPU i can just make a switch which changes which chips CE is connected to th...

Ahh i did some google-ing found it on the 9002 (PU-23) board as IC102 it has sony written on it, i should be able to remove that with some patience. Would anyone who has a bit more electronic know how be able to tell me if its possible to do something similar to this. http://i36.photobucket.com/albu...

I may get around to it, really would like the newer BIOS on the PS1 that has the parallel port (which i plan to use for PSIO when that arrives). In the mean time i got a whole laser mech for $8 from china :D Would someone be so kind as to point me in the direction of the BIOS chips? I have a suspici...

So in "theory" if i was to desolder the 9002 bios and threw it in the 5502 it would work fine?

Hi, i have a few PSXes sitting around, i was curious if it is possible to say take the BIOS from a SCPH-9002 and use it in a SCPH-5502? That way i could in theory use the nicer (and more nostalgic) bios menu that also has the cd audio visualizations on the psx with the parallel port. Anyway im start...

Pretty cool, makes me wish i had a pocket station haha

So im not much of a forum go-er but i can give this a shot.

A am Dan9550 also known in the real world as Danny, currently just finished studying i also enjoy a bit of electronics modding and computer tinkering on the side. I have a crazy mind!