Search found 67 matches

by cybdyn
October 12th, 2016, 6:01 am
Forum: Hardware
Topic: Datel's VMEM Addon (other questions too)
Replies: 38
Views: 33669

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 cybdyn
October 12th, 2016, 5:22 am
Forum: Input/Output
Topic: [PS1] Interact V-Mem - ROM or firmware dump
Replies: 4
Views: 3465

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 cybdyn
November 17th, 2015, 8:45 pm
Forum: Input/Output
Topic: SCPH-1002 BIOS corrupt.
Replies: 7
Views: 6806

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 cybdyn
November 7th, 2015, 9:38 pm
Forum: Input/Output
Topic: SCPH-1002 BIOS corrupt.
Replies: 7
Views: 6806

Re: SCPH-1002 BIOS corrupt.

laser head is bad- it's a cause of problems. it's not BIOS)))
by cybdyn
October 24th, 2015, 6:44 pm
Forum: Input/Output
Topic: Rumble not working
Replies: 6
Views: 3858

Re: Rumble not working

chk power fuses))) on console's borad
by cybdyn
October 19th, 2015, 3:06 am
Forum: Work Logs / Projects
Topic: MicroSD Memory Card Emulator
Replies: 5
Views: 8416

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 cybdyn
July 25th, 2015, 9:51 am
Forum: Work Logs / Projects
Topic: CommLinkUSB
Replies: 19
Views: 22386

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 cybdyn
May 4th, 2015, 5:54 pm
Forum: Research
Topic: Playstation CPU reversing [56k Warning]
Replies: 67
Views: 61605

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 cybdyn
May 3rd, 2015, 10:44 pm
Forum: Work Logs / Projects
Topic: PSX CD-Player only Project
Replies: 80
Views: 92154

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 cybdyn
April 27th, 2015, 10:38 pm
Forum: Miscellaneous / Off Topic
Topic: Is this thing worth buying?
Replies: 11
Views: 17742

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 cybdyn
April 23rd, 2015, 6:44 pm
Forum: Research
Topic: How to dump your CDROM BIOS (Firmware)
Replies: 132
Views: 111407

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 =1 and ch...
by cybdyn
March 12th, 2015, 5:48 pm
Forum: Research
Topic: SCPH-5903 PSX VCD Main/Sub-board Images
Replies: 39
Views: 37039

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 cybdyn
February 6th, 2015, 8:30 pm
Forum: Research
Topic: How to dump your CDROM BIOS (Firmware)
Replies: 132
Views: 111407

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 cybdyn
February 5th, 2015, 8:39 pm
Forum: Research
Topic: How to dump your CDROM BIOS (Firmware)
Replies: 132
Views: 111407

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 cybdyn
January 30th, 2015, 12:42 am
Forum: Research
Topic: How to dump your CDROM BIOS (Firmware)
Replies: 132
Views: 111407

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-dsp, in sa...
by cybdyn
January 26th, 2015, 6:23 pm
Forum: Hardware
Topic: 240v on SCPH-1000 Power supply?
Replies: 22
Views: 23994

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 way i used p...
by cybdyn
January 15th, 2015, 8:40 pm
Forum: Research
Topic: Playstation CPU reversing [56k Warning]
Replies: 67
Views: 61605

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 cybdyn
January 14th, 2015, 10:06 pm
Forum: Research
Topic: Playstation CPU reversing [56k Warning]
Replies: 67
Views: 61605

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 cybdyn
January 14th, 2015, 1:05 am
Forum: Research
Topic: Playstation CPU reversing [56k Warning]
Replies: 67
Views: 61605

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...
by cybdyn
January 3rd, 2015, 1:27 am
Forum: Sound/SPU
Topic: Need help on looping XA audio tracks
Replies: 7
Views: 5778

Re: Need help on looping XA audio tracks

I think this can be done nicely by checking for the 'End of Record' bit inside the subheader structure in each XA audio sector being played but I don't know of a way to extract the subheader during playback. yeah, one of the way is chk for EOR flag in subhader. by CdgetlocL command. another way, dun...