PSOne development kit

[locarno]

It is possible to convert stock PSone to PSone dev-kit (yaroze). Flash memory (bios etc) from Yaroze, to PSone. One person from Polish scene did it (in 4 years). But he didn't want talk about it. So it is possible ?

[Orion_]

when I see the psone from the no$cash guy: http://problemkaputt.de/psx-xboo.jpg
I guess, everything is possible, you just need the electronic skills to do it

[Shendo]

It's possible since it's basically the same machine (with a few subtle differences) in a smaller form factor.

Yaroze has a different mechacon then retail units which allows you to boot software from all region plus yaroze discs.
That can be solved by installing a modchip, either MM3 for SCPH-101 or OneChip for SCPH-102.

Yaroze uses serial cable to communicate with PC. That can be done with the PSone too.
There are test points on the board where you can solder a TTL adapter and connect it to your PC via USB.
More info can be found here and here.

As for BIOS, it's nothing special so you actually don't have to change it and in case of
SCPH-102 OneChip removes the european licence check.

Yaroze boot disc has been patched and Access Card is not needed anymore, which means you are good to go.

--
Also, there is a utility called PSXSERIAL which you can use to upload EXEs to your (retail) PS1 without the
Yaroze boot disc and it also allows you to upload bigger executables.
You can also use official PsyQ sdk or open source PSXSDK (the one I use ) with it.

[locarno]

Yaroze boot disc has been patched and Access Card is not needed anymore, which means you are good to go.

Can you share more info about this Access Card ?

[CodeAsm]

Can you share more info about this Access Card ?

https://en.wikipedia.org/wiki/Net_Yaroze
"The Access Card, a dongle which must be placed in memory card port 1 in order to boot programs which were loaded from a PC."
It was a memorycard without the storage IC and the program on the controller IC was running a diferent program than normal memorycards where. probably replying wich region it was and that it allowed netyaroze homebrew. the whole card is needed was removed from the startup disk if you burn a cracked netyaroze disk.

I cant find the topics on this forum about this accesscard but this is wat I remember reading about it. cool and smart idea from Sony to have a "dongle"... sad their copyprotection was so "easily" broken and the software be patched. (I dont know if that was done back in the day aswell) anyway, you only need the cracked disk instead of a original accesscard. everyone with a modded PS1 can do netyaroze stuff now

[danhans42]

The cracked disc or the AR codes to patch it have been around since 1998, the details were on a site that was hosted on Geocities back in the day. The site had the rest of the tools on there, as well as a patched iso. Only problem was that the licence info was missing from it so it rarely booted correctly.

It might be on way back machine or something..

[Administrator]

The cracked disc or the AR codes to patch it have been around since 1998, the details were on a site that was hosted on Geocities back in the day. The site had the rest of the tools on there, as well as a patched iso. Only problem was that the licence info was missing from it so it rarely booted correctly.

It might be on way back machine or something..

I patched it with the correct license sector data in 2013. It's available here.