Search found 10 matches

by fulas
July 21st, 2020, 7:39 am
Forum: Work Logs & Projects
Topic: PAD Serial
Replies: 24
Views: 33802

Re: PAD Serial

Wow , it seem that you are having a hard work, congratulation sir, nice to see you around here. Salu2 amigo.
by fulas
April 2nd, 2018, 7:17 pm
Forum: Research
Topic: BIOS region check routine bypassing
Replies: 24
Views: 51643

Re: BIOS region check routine bypassing

This approach seems great so far. About that CPU speed: I really don't know much about ROM reading yet but I assumed that OE pin was there to signal that data is ready. Shouldn't this enable us to deliver the data at the speed we want? AFAIK OE is a signal from MIPS to get data from memory , in oth...
by fulas
March 31st, 2018, 6:49 am
Forum: Research
Topic: BIOS region check routine bypassing
Replies: 24
Views: 51643

Re: BIOS region check routine bypassing

Going a little further , Arduino Uno runs at 16MHz while PSX CPU at 32MHz , don't know how many cycles of clock are consumed by a external-memory read, but is pretty sure the UNO is too slow to send data at wanted time, the problem would be solve by slowing down the CPUCLK through IC204 CLK GEN
by fulas
March 30th, 2018, 4:41 am
Forum: Research
Topic: BIOS region check routine bypassing
Replies: 24
Views: 51643

Re: BIOS region check routine bypassing

Anyone any thoughts on the reduced wiring BIOS replacement? I'd love to hear some opinions before diving into it ;p I don't know ,but I think that the last chips for PS2 ,like Modbo, Cristal Chip, Matrix Infinity... works with that behaiviour . If you look at one intallation diagram , it seems like...
by fulas
July 13th, 2017, 3:01 am
Forum: NO$PSX Emulator
Topic: NOCASH PSX-BIOS SWAP
Replies: 20
Views: 61027

Re: NOCASH PSX-BIOS SWAP

It's working YESSSSSSSSSSS¡¡¡¡¡¡¡¡¡¡¡ At a moment I can switch original and nopsxbios by joining CPU.97 CS2 to any CHIP SELECT roms. The flash that I has used is a 29f040 512kb, like Nocash told me: With a 256Kbyte chip (what you seem to have in the 2nd photo), just store the 256Kbyte in ...
by fulas
July 12th, 2017, 9:18 am
Forum: NO$PSX Emulator
Topic: NOCASH PSX-BIOS SWAP
Replies: 20
Views: 61027

Re: NOCASH PSX-BIOS SWAP

That chip is mapped as in cheat devices? With the chipselect wired to the expansion area select line, instead of the bios area select line? That won't work with current bios clone version (and probably also won't work in next version - unless you have reproduced the whole cheat device hardware, inc...
by fulas
July 12th, 2017, 2:24 am
Forum: NO$PSX Emulator
Topic: NOCASH PSX-BIOS SWAP
Replies: 20
Views: 61027

Re: NOCASH PSX-BIOS SWAP

I have another question to Nocash, your bios/file, PSX-XBOO.ROM, is 256 kb lengh What do I have to do with the rest,512kb, of the flash ? fill with FF perhaps ? And how about using the upper memory flash, A18, for gameshark,action replay.... purposes? Would be realy nice job, of course if Psone does...
by fulas
July 11th, 2017, 9:04 am
Forum: NO$PSX Emulator
Topic: NOCASH PSX-BIOS SWAP
Replies: 20
Views: 61027

Re: NOCASH PSX-BIOS SWAP

Well this picture is from other Psone, it's wired to work like Action replay/Gameshark.... http://i63.tinypic.com/2wq4dj9.jpg It is not so elegant as the first post :oops: :oops: but have erase option :roll: :roll: I have a few 29f040b that I will wire with your schematic Nocash PSX-BIOS Connection ...
by fulas
July 11th, 2017, 7:58 am
Forum: NO$PSX Emulator
Topic: NOCASH PSX-BIOS SWAP
Replies: 20
Views: 61027

Re: NOCASH PSX-BIOS SWAP

That http://i68.tinypic.com/23stbpc.jpg photo is showing... a PROM ??? That chip isn't even UV-eraseable, so you have only one single attempt to get the programming logic right, not to mention the programming voltages. Well, good luck with it - but I have some doubts, to say the least. Using a simi...
by fulas
July 11th, 2017, 4:50 am
Forum: NO$PSX Emulator
Topic: NOCASH PSX-BIOS SWAP
Replies: 20
Views: 61027

NOCASH PSX-BIOS SWAP

Hello to all members and thanks for this great site. I'm attempt to add a second BIOS to a my PSONE scph-102, thanks Nocash for his awesome work , :praise :praise and of course I have a few questions: 1.As far as I know the PSONE ,and old ones, has a Rom that is organized as 512K by 8 bits, I'm plan...