Search found 15 matches

by dan9550
July 23rd, 2014, 8:08 pm
Forum: Hardware
Topic: BIOS Swap?
Replies: 42
Views: 29093

Re: BIOS Swap?

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...
by dan9550
July 22nd, 2014, 10:01 pm
Forum: Hardware
Topic: BIOS Swap?
Replies: 42
Views: 29093

Re: BIOS Swap?

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...
by dan9550
June 28th, 2014, 11:18 pm
Forum: Hardware
Topic: BIOS Swap?
Replies: 42
Views: 29093

Re: BIOS Swap?

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.
by dan9550
June 28th, 2014, 4:38 pm
Forum: Hardware
Topic: BIOS Swap?
Replies: 42
Views: 29093

Re: BIOS Swap?

Here you go:
Image

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 :P
by dan9550
June 28th, 2014, 4:13 pm
Forum: Hardware
Topic: BIOS Swap?
Replies: 42
Views: 29093

Re: BIOS Swap?

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?
by dan9550
June 28th, 2014, 3:43 pm
Forum: Hardware
Topic: BIOS Swap?
Replies: 42
Views: 29093

Re: BIOS Swap?

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!
by dan9550
June 27th, 2014, 12:27 am
Forum: Hardware
Topic: BIOS Swap?
Replies: 42
Views: 29093

Re: BIOS Swap?

aww no magic smoke :(
by dan9550
June 26th, 2014, 11:47 pm
Forum: Hardware
Topic: BIOS Swap?
Replies: 42
Views: 29093

Re: BIOS Swap?

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!?
by dan9550
June 26th, 2014, 9:53 pm
Forum: Hardware
Topic: BIOS Swap?
Replies: 42
Views: 29093

Re: BIOS Swap?

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...
by dan9550
June 26th, 2014, 12:30 am
Forum: Hardware
Topic: BIOS Swap?
Replies: 42
Views: 29093

Re: BIOS Swap?

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...
by dan9550
June 26th, 2014, 12:16 am
Forum: Hardware
Topic: BIOS Swap?
Replies: 42
Views: 29093

Re: BIOS Swap?

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...
by dan9550
June 25th, 2014, 11:22 pm
Forum: Hardware
Topic: BIOS Swap?
Replies: 42
Views: 29093

Re: BIOS Swap?

So in "theory" if i was to desolder the 9002 bios and threw it in the 5502 it would work fine?
by dan9550
June 24th, 2014, 11:11 pm
Forum: Hardware
Topic: BIOS Swap?
Replies: 42
Views: 29093

BIOS Swap?

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...
by dan9550
December 30th, 2013, 4:38 pm
Forum: Miscellaneous / Off Topic
Topic: [PocketStation] NyanCat
Replies: 8
Views: 7637

Re: [PocketStation] NyanCat

Pretty cool, makes me wish i had a pocket station haha
by dan9550
December 30th, 2013, 4:25 pm
Forum: General Chat / Messaging
Topic: Let's Forum
Replies: 1
Views: 1814

Let's Forum

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!