Thanks for Your words. PCB design above (for TSOP) has the dual BIOS capability, but I tried that only once a year ago with wrong BIOS writed. I wanted to use a 1001 as device 2 (PS1 BIOS ROM) and no$cash BIOS as device 0 (expantion ROM). They won't work cause back then no$cash BIOS has no capabilit...

Hello, can't say that my old work will be helpfull to the @xrider or anyone else but here is the link to an old AG thread: https://assemblergames.com/threads/ps1-bios-pcbs.68957/ Attachment shows how's it look. It's PSX-XBOO programmed (modchip is not needed but it still there, don't know why I didn...

As cybdyn said it's better to upgrade diods too. Just made my 110v to work with 220v. For now I replaced 5 diods and 3 caps. I'll attach some pics for that. It works well and it's free of noise or heat. Have to test it more, wanted to replace Q001 (2sc4054) and Q002 (2sc1714) to become 2sc4231 and 2...

... have to reflash it with kHn's XFlash mod with Unirom or something else thats 128K. SST29EE010 is not siutable for no$cash BIOS clone cause it has no such amount of memory space that BIOS clone needed. 29EE010 is 128kByte EEPROM but you need xxxx020 (256kByte) or xxxx040 (512kByte) EEPROM. Also ...

SCPH-103(J) BIOS is 4.5 version as I can see in HEX editor. Cause of original BIOS collection thread is locked I'll post it here.

Seems like it's the same connector that external PCMCIA PS2 HDD has. I might be wrong, but who knows. I don't have PS1 like yours but I do have that HDD. Thoght these connectors looks the same. https://m.ebay.com/itm/Sony-DTL-H20400-PlayStation-2-Development-Tool-Hard-Disk-Drive-AC-Adapter/263089473...

Hello. Finaly I were able to swap BIOS too. It works fine on 9000 and 102, but one thing I need to know about PSX-BOO bios - the modchip feature. ### Nocash BIOS "Modchip" Feature (optional) SPU.Pin42 "data" -------|>|------ CPU.Pin149 (A20) SPU.Pin5 "sync" ------------...

rama3 wrote: ↑December 19th, 2017, 2:37 am This might be a picture of the very last PSone. I've never seen that -82 motherboard subrevision either. The ROM is probably the missing 4.5a.

So, the 1-679-335-82 is the very last MOBO? I do have one, SCPH-103J. Just curios if there are any others.

Hello everyone.
PS1 SCPH-5000 PU-8. I did it and it works great. Thanks.