Search found 10 matches

by org
July 31st, 2016, 8:58 pm
Forum: Research
Topic: Old 160pin GPU Pinout & Rendering Differences
Replies: 8
Views: 12658

Re: Old 160pin GPU Pinout

I made additional research on connections between old GPU chips: http://psxdev.ru/images/wys/old_gpu1.png (Open image in new tab for full scale) (Based on older PU-8 motherboard scans: http://siliconpr0n.org/map/sony/pu-8_1-658-467-11/ ) Mentioned by Martin "142 OSC 53.20MHz" looks like plain GND to...
by org
January 23rd, 2016, 9:34 am
Forum: Research
Topic: Playstation CPU reversing [56k Warning]
Replies: 68
Views: 85041

Re: Playstation CPU reversing [56k Warning]

Latest progress on my side. I was focused to improvement of chip reversing toolkit. In last few month two dedicated tools was developed. First one is patterns , used to identify standard cells over source image of polysilicon/diffusion layer. http://psxdev.ru/images/wys/patterns_preview.jpg Result d...
by org
January 14th, 2016, 11:50 pm
Forum: Research
Topic: How to disassemlbe/edit PSX BIOS ?
Replies: 12
Views: 17278

Re: How to disassemlbe/edit PSX BIOS ?

SCPH-1001 reversing:

https://github.com/ogamespec/psxdev/tree/master/reverse

IDA 6.5 project in SCPH1001.zip
by org
July 2nd, 2015, 11:29 pm
Forum: Research
Topic: Playstation CPU reversing [56k Warning]
Replies: 68
Views: 85041

Re: Playstation CPU reversing [56k Warning]

GTE location is confirmed at bottom-left corner of the chip (Part 02). Source: http://www.psxdev.ru/images/wys/psxcpu_layout.jpg Almost all cells of this area are identified. There are total 6600 cells (Part 02), but some of them are used by MDEC YUV-RGB circuit (Akari working on it). Left part cont...
by org
August 23rd, 2014, 5:38 am
Forum: Miscellaneous
Topic: Experimental PS1 Wiki
Replies: 12
Views: 15606

Re: Experimental PS1 Wiki

I don't see why we need a wiki. Wiki is a good tool for searching and structuring information, do not underestimate it ;) We have done a lot of work to gather information on a huge number of revisions of PSX motherboards and chipsets, only need is to bring a little update and cleanup. English trans...
by org
May 22nd, 2014, 5:17 pm
Forum: Research
Topic: How to dump your CDROM BIOS (Firmware)
Replies: 132
Views: 152857

Re: Dump your CDROM BIOS

Is there any place to keep all dumps together?
by org
September 11th, 2013, 10:16 pm
Forum: Work Logs / Projects
Topic: CD-decoder ROM dumped
Replies: 9
Views: 11552

Re: CD-decoder ROM dumped

He opened it and wired mircowires directly to the chip internal bus.
by org
September 11th, 2013, 7:13 pm
Forum: Work Logs / Projects
Topic: CD-decoder ROM dumped
Replies: 9
Views: 11552

Re: CD-decoder ROM dumped

It has only 512 byte of RAM :) And its impossible to inject code into SUB-CPU since you can control it only by setting CD-registers, which is not allow to do stack overflow or something.
by org
September 11th, 2013, 2:42 am
Forum: Work Logs / Projects
Topic: CD-decoder ROM dumped
Replies: 9
Views: 11552

Re: CD-decoder ROM dumped

This is single custom chip, made by Motorola. It usually labeled as IC304 and it was never integrated in bigger chips. On early MBs you can find it on side-B, its 42-pin IC. On modern MBs its usually located near SUB-IC (IC732). Both ROMs are inside. He managed to dump it by wiring directly to the c...
by org
September 11th, 2013, 12:46 am
Forum: Work Logs / Projects
Topic: CD-decoder ROM dumped
Replies: 9
Views: 11552

CD-decoder ROM dumped

Hi everybody :) Not long time ago we started PSX chip research project : http://psxdev.ru Our primary project is PSX CPU ( IC103 ) We contacted some people and asked them to decap and image PSX chips, to further explore them. One decapper successfully depackaged CD-decoder microcontroller ( IC304 ),...