Search found 25 matches

by legacy
September 16th, 2018, 4:13 am
Forum: Documentation
Topic: Playstation and PsOne chip's pinout
Replies: 1
Views: 1657

Playstation and PsOne chip's pinout

hi
is there a document that tells the pinout of the chip on the motherboard?
particularly, I am interested in the graphics coprocessor
by legacy
September 12th, 2013, 12:46 am
Forum: Work Logs / Projects
Topic: CD-decoder ROM dumped
Replies: 9
Views: 10459

Re: CD-decoder ROM dumped

i think you'd better translate in English, else way i can understand less than the 5% of the content. Anyway, i am replacing the PSX bios with a piece of custom firmware, it should be interesting to use the CD-decoder 68hc05 in such a way, what do you suggest ? In my firmware i have the full control...
by legacy
September 11th, 2013, 8:39 pm
Forum: Work Logs / Projects
Topic: CD-decoder ROM dumped
Replies: 9
Views: 10459

Re: CD-decoder ROM dumped

well, it is like 68hc11 E series, 512byte of ram, too, i am using it to interface the PAD, i have written an assembly driver =P

anyway, how was the dump done ? how could you dump it ?
by legacy
September 11th, 2013, 6:23 am
Forum: Work Logs / Projects
Topic: CD-decoder ROM dumped
Replies: 9
Views: 10459

Re: CD-decoder ROM dumped

interesting, could be documented this procedure ? and ... is it possible to inject a code in ram in order to execute ?
by legacy
September 11th, 2013, 2:03 am
Forum: Work Logs / Projects
Topic: CD-decoder ROM dumped
Replies: 9
Views: 10459

Re: CD-decoder ROM dumped

could you help me to identify the chip on the PSX mobo ? do i understand right ? is there such a chip in the mobo ? where is the rom ? inside the MPU or external ? is it possible to boot different code in such a chip ?
by legacy
September 10th, 2013, 11:56 pm
Forum: General Chat / Messaging
Topic: Hello everyone
Replies: 4
Views: 3715

Re: Hello everyone

hello =)
by legacy
September 9th, 2013, 7:13 am
Forum: General Chat / Messaging
Topic: hello
Replies: 0
Views: 1608

hello

wops i forget to post here first =) what i have to say ? first of all, thank you for this web, it is full of very interesting tricks & tips. what about me ? I can say that i like Mips so much that i have bought an older Atlas board (MIPS32-r1)and a lot of MIPS books i can find on Amazon, e.g. " see ...
by legacy
September 9th, 2013, 2:29 am
Forum: Work Logs / Projects
Topic: Ultimate Playstation Project.. Please help!
Replies: 6
Views: 7292

Re: Ultimate Playstation Project.. Please help!

A pretty proof of concept video of PSIO PSIO is a cartridge that plug's into the back of your PlayStation 1 console, which will let you play your backed up PlayStation 1 games from an SD card. It will also allow you to boot and run code you have programmed from an SD card on the actual PlayStation 1...
by legacy
September 8th, 2013, 8:41 pm
Forum: Work Logs / Projects
Topic: replacing the bios with a custom piece of bareboard firmware
Replies: 6
Views: 7242

Re: replacing the bios with a custom piece of bareboard firm

Thanks, i am also studying yaboot, pretty sources for R3000, too Everything You Have Always Wanted to Know about the Playstation But Were Afraid to Ask. [...] The R3000A is configured for litle-endian byte order and defines a word as 32-bits, a half-word, as 16-bits, and a byte as 8-bits. The Status...
by legacy
September 8th, 2013, 7:07 am
Forum: Work Logs / Projects
Topic: replacing the bios with a custom piece of bareboard firmware
Replies: 6
Views: 7242

Re: replacing the bios with a custom piece of bareboard firm

OK, today i desoldered an other playstation bios, i am pretty ready for the eprom emulator

could someone suggest me a bit of early boot assembler ? just the first things the R3000 should do in order to be pretty initialized.
by legacy
September 6th, 2013, 12:09 am
Forum: Work Logs / Projects
Topic: replacing the bios with a custom piece of bareboard firmware
Replies: 6
Views: 7242

Re: replacing the bios with a custom piece of bareboard firm

i could look for the Yamon (1) source code in order to write an extremely easy and essential earlyboot ? what do you think ?


(1) it is the firmware used in Atlas and Malta boards, developed by MIPS inc
I've got an Atlas board, it is MIPS32-r2, while PSX is MIPS-R3K ...
by legacy
September 6th, 2013, 12:01 am
Forum: Work Logs / Projects
Topic: PSone BIOS modding project
Replies: 28
Views: 39179

Re: PSone BIOS modding project

bios is sourced by 3.3v. )) but in some cases AR used 5v flash IC. it gets from 7.5v from parralel-io through down dc/dc converter yes, i confirm: 1) PSOne has MASK-Rom.vcc=3.3V 2) Playstation1 has MASK-Rom.vcc=3.3V my AR has a 29xxx flash (in DIP package) with vcc=5V through an LDO regulator 7805 ...
by legacy
September 5th, 2013, 11:54 pm
Forum: Work Logs / Projects
Topic: Ultimate Playstation Project.. Please help!
Replies: 6
Views: 7292

Re: Ultimate Playstation Project.. Please help!

well, first of all: where do you plug the pATA interface ? On the PIO ? So you have to design a new PIO interface, as i am doing just in order to have 4x32bit latches to handle a C9800 (level voltage adapted to 3.3V) net board. A lot of work to produce the PCB and solder the chip, than the device is...
by legacy
September 5th, 2013, 9:32 pm
Forum: Input/Output
Topic: PSX Keyboard and Mouse Adaptor (SCPH-2000 Prototype)
Replies: 49
Views: 43886

Re: PSX Keyboard and Mouse Adaptor (SCPH-2000 Prototype)

where have you seen SCPH-2000 Prototype ?
are them destroyed by SONY ?

About the PIO, I am planning to add a C8900 (ethernet 10Mbit/sec) , and a NVram of 2Mbyte to Playstation1.
by legacy
September 5th, 2013, 9:26 pm
Forum: Input/Output
Topic: SIO Low Level Access
Replies: 5
Views: 5861

Re: SIO Low Level Access

Is it SONY custom hw and protocol ? I know the PAD signals and protocol from the memorycard point of view, i don't know how the playstation is generating and handling bits, from what i see there is a dedicated hw which simply require a control_status, and a buffer to read/write from/to. So ... i don...
by legacy
September 5th, 2013, 8:48 pm
Forum: Work Logs / Projects
Topic: replacing the bios with a custom piece of bareboard firmware
Replies: 6
Views: 7242

Re: replacing the bios with a custom piece of bareboard firm

About the PAD ... it may be it is similar to SPI, it is not clear to me how it works, but it may be it could be used to attach an SPI-ethernet board to be used with UDP/IP in order to have a faster upload/download.

This topic is about CPU-SIO-PAD
by legacy
September 5th, 2013, 8:45 pm
Forum: Work Logs / Projects
Topic: replacing the bios with a custom piece of bareboard firmware
Replies: 6
Views: 7242

replacing the bios with a custom piece of bareboard firmware

why ? because i'd like to have a MIPS board to toy with, directly in assembly and C, without having to fight with the magic of what SONY has put inside her Mask Rom. I'd like to have only the SIO support and nothing else except the PAD. I have desoldered the PSOne bios and wire soldered all the bios...
by legacy
September 5th, 2013, 9:06 am
Forum: Work Logs / Projects
Topic: PSone BIOS modding project
Replies: 28
Views: 39179

Re: PSone BIOS modding project

It looks very similar to 29040 eprom, very interesting =)
by legacy
September 5th, 2013, 8:52 am
Forum: Work Logs / Projects
Topic: toying with the SIO
Replies: 2
Views: 2595

Re: toying with the SIO

thank you, it is really appreciated cause it is very very important for the goal i am aiming for
by legacy
September 5th, 2013, 8:44 am
Forum: Other SDK
Topic: SIO Library for Tails's SDK
Replies: 4
Views: 5388

Re: SIO Library for Tails's SDK

A data byte can be read when SIO_STAT.1=1

Code: Select all

uint8_t ReadByteSIO()
{
        while ( ((*SIO_STAT & 0x2)>>1) !=1 )
                {
                /* wait */
                }
        return *SIO_RX;
}