Search found 68 matches

by Yuri^Cybdyn
October 8th, 2023, 5:51 am
Forum: General Chat & Messaging
Topic: Sony Discman with PS1 laser
Replies: 14
Views: 12968

Re: Sony Discman with PS1 laser

Vr-Mode - could you show another side of PCB? wondering what type of mecha/mcu it's using)
by Yuri^Cybdyn
October 12th, 2016, 6:01 am
Forum: Hardware
Topic: Datel's VMEM Addon (other questions too)
Replies: 38
Views: 70954

Re: Datel's VMEM Addon (other questions too)

interesting, if it based on replacing of bios calls, which work around mem-card device (like INIT, READ, WRITE), so it might be possible to redirect it to work like V-mem with other external devices))
by Yuri^Cybdyn
October 12th, 2016, 5:22 am
Forum: Input/Output
Topic: [PS1] Interact V-Mem - ROM or firmware dump
Replies: 4
Views: 12170

Re: [PS1] Interact V-Mem - ROM or firmware dump

interesting, if it based on replacing of bios calls, which work around mem-card device (like INIT, READ, WRITE), so it might be possible to redirect it to work like V-mem with other external devices))
by Yuri^Cybdyn
November 17th, 2015, 8:45 pm
Forum: Input/Output
Topic: SCPH-1002 BIOS corrupt.
Replies: 11
Views: 27384

Re: SCPH-1002 BIOS corrupt.

bad laser on a psx that can play audio discs and load the boot executable? Yeah, it's not 100% dead, and the problem maybe in lens, motor, or something else in mechanics, like it load data from center of the disc, but when heal go to out corner of the disc it fails.. especially it relate to FMV fre...
by Yuri^Cybdyn
November 7th, 2015, 9:38 pm
Forum: Input/Output
Topic: SCPH-1002 BIOS corrupt.
Replies: 11
Views: 27384

Re: SCPH-1002 BIOS corrupt.

laser head is bad- it's a cause of problems. it's not BIOS)))
by Yuri^Cybdyn
October 24th, 2015, 6:44 pm
Forum: Input/Output
Topic: Rumble not working
Replies: 6
Views: 11700

Re: Rumble not working

chk power fuses))) on console's borad
by Yuri^Cybdyn
October 19th, 2015, 3:06 am
Forum: Work Logs & Projects
Topic: MicroSD Memory Card Emulator
Replies: 5
Views: 17563

Re: MicroSD Memory Card Emulator

we plan do some thing to save mem card on SD. through ps1 lib access to mem, and read/write sata to SD by psio.

another interesting idea would be emulation by psio memcard as-is, but i see ppl dislike solder wires, so it'll better start from first idea above, just move data to SD.
by Yuri^Cybdyn
July 25th, 2015, 9:51 am
Forum: Work Logs & Projects
Topic: CommLinkUSB
Replies: 19
Views: 42930

Re: CommLinkUSB

hmm, we have on psio mcu w/ usb 2.0 and fpga for xfer buffer. so speed is quite fast if aim is to load ps-exe, or excahnge data. we even can play games w. video in games/ ok, it's not cheap way, enad easy to DYI... but idea add some wireless comuniation is interesing))) for such case like DYI, we un...
by Yuri^Cybdyn
May 4th, 2015, 5:54 pm
Forum: Research
Topic: Playstation CPU reversing [56k Warning]
Replies: 68
Views: 184846

Re: Playstation CPU reversing [56k Warning]

no$ : i found game like "Felony 11-79", whant it plays interleved xa stream from cd , it doesnt send any SetFilter command (to setup file/channel), and to play cdxa stream it uses mode = 0x40 (adpcm enable), the xa stream consist of 4 interlived files, not channels! ususally games use file...
by Yuri^Cybdyn
May 3rd, 2015, 10:44 pm
Forum: Work Logs & Projects
Topic: PSX CD-Player only Project
Replies: 87
Views: 206403

Re: PSX CD-Player only Project

i found STM32 DISCO board w/ touchscreen lcd (on DigiKey ~14$). i think it will be better hw for such project?
by Yuri^Cybdyn
April 27th, 2015, 10:38 pm
Forum: Miscellaneous & Off Topic
Topic: Is this thing worth buying?
Replies: 11
Views: 32433

Re: Is this thing worth buying?

Hello fellow PSX developers.I want to get into PlayStation development,and i saw this thing http://store.imgtec.com/us/product/mips-creator-ci20/ is MIPS based. So my question is can i learn MIPS Assembly on this? (I started programming 2-3 years ago is it early to get into such a thing?) interesti...
by Yuri^Cybdyn
April 23rd, 2015, 6:44 pm
Forum: Research
Topic: How to dump your CDROM BIOS (Firmware)
Replies: 144
Views: 385039

Re: How to dump your CDROM BIOS (Firmware)

no$ : i found game like "Felony 11-79", whant it plays interleved xa stream from cd , it doesnt send any SetFilter command (to setup file/channel), and to play cdxa stream it uses mode = 0x40 (adpcm enable), the xa stream consist of 4 interlived files, not channels! ususally games use file...
by Yuri^Cybdyn
March 12th, 2015, 5:48 pm
Forum: Research
Topic: SCPH-5903 PSX VCD Main/Sub-board Images
Replies: 39
Views: 114321

Re: SCPH-5903 PSX VCD Main/Sub-board Images

no$: can you explain a little?)) CDROM Command: 1F 01 7F FF 02 01 00 (once) CDROM Command: 1F 01 7F FF 02 FF 00 (repeated infinitely) to where bios sends this set, afik cmd register hold only 1 byte, and 8(16) for params. or you mean cmd [ 1f ] , with prams [ 01 7F FF 02 01 00 ] afik: 1f is extended...
by Yuri^Cybdyn
February 6th, 2015, 8:30 pm
Forum: Research
Topic: How to dump your CDROM BIOS (Firmware)
Replies: 144
Views: 385039

Re: How to dump your CDROM BIOS (Firmware)

thanx for reply!)

i think if it writes int flag 0x18. it off firing INT line from dsp, and maybe chk for INT status manually. i found and dis-asm this code. as i see it uses no-standard cdlib code. maybe asm/C mix)) and direclty send commands and check INT cdreg.
by Yuri^Cybdyn
February 5th, 2015, 8:39 pm
Forum: Research
Topic: How to dump your CDROM BIOS (Firmware)
Replies: 144
Views: 385039

Re: How to dump your CDROM BIOS (Firmware)

no$cash: can you tell more if you found any signs about extra INT bits. i mean, normally it uses mask of 0x7 (for int1,2, 3,4,5). but there are two last bits (0x8 and 0x10). you told about one of them, used as cmd-acknowledge flag. did you see something about it in dis-asm code? i saw in Resident ev...
by Yuri^Cybdyn
January 30th, 2015, 12:42 am
Forum: Research
Topic: How to dump your CDROM BIOS (Firmware)
Replies: 144
Views: 385039

Re: How to dump your CDROM BIOS (Firmware)

no$cash: THANKS for amazing work in ps1 cdrom bios disassembling. it's awesome!!! very interesting if you can do same for ps2))) ? .not sure, but sony used another mcu (not hc05, maybe 32bit), all chip models have "CXD" prefix . but from service schemes, we can see how it attached to cdvd-...
by Yuri^Cybdyn
January 26th, 2015, 6:23 pm
Forum: Hardware
Topic: 240v on SCPH-1000 Power supply?
Replies: 22
Views: 56759

Re: 240v on SCPH-1000 Power supply?

i can only say what i did: i changed Diods (like you said "black-resistors") , and ! big Capasitor for 400v! i got part from broken PSU of 220v, to fix/remake from 110v (NTSC-U ps1) to 220v . it worked well, but, little noise i heard. like zr-zr-zr.. even louder in idle state))) another wa...
by Yuri^Cybdyn
January 15th, 2015, 8:40 pm
Forum: Research
Topic: Playstation CPU reversing [56k Warning]
Replies: 68
Views: 184846

Re: Playstation CPU reversing [56k warning]

about EOF flag, just idea. maybe this bit make from 0x64 to 0xE4 , and we need play as xa and send as data at same time (int1) to let know mips-cpu program "this is the end"?
by Yuri^Cybdyn
January 14th, 2015, 10:06 pm
Forum: Research
Topic: Playstation CPU reversing [56k Warning]
Replies: 68
Views: 184846

Re: Playstation CPU reversing [56k warning]

i just thougth LC mechanism uses only combination seekl+getposP. but i see it uses read 1b.
just some games send getposP 10 times or so, after seekP, just wondring if i need update or increment pos. , or it stays on same pos, and only frame changes around last position of seeking..
by Yuri^Cybdyn
January 14th, 2015, 1:05 am
Forum: Research
Topic: Playstation CPU reversing [56k Warning]
Replies: 68
Views: 184846

Re: Playstation CPU reversing [56k warning]

no$: can chk also about EOR/EOF bit , for example Resedent Evil 1: after last cutscene before menu, it still play xa audio. i dont know what real cd dsp/hc05 does , but i just stop play xa sound. maybe if you will find new details, add please it on tech spec about Ps1)) ? also: don't you know, combi...