Best modchip ?

General information to do with the PlayStation 1 Hardware. Including modchips, pinouts, rare or obscure development equipment, etc.
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Best modchip ?

Post by Squaresoft74 » April 5th, 2016, 1:09 pm

Hello,

I have a few PAL SCPH-1002, SCPH-5502, SCPH-7002 and SCPH-7502 units and i was wondering as of 2016, which modchip i should install in those.
It's been a while since I last checked this kind of stuff, so i don't know if there is any solution better than another.
Any recommendation ?

Thanks :)

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Post by LordHexahedron » April 8th, 2016, 3:51 am

I have personally had great success with MM3 chips (you can either flash them yourself using the OpenMM3 firmware dump or buy them from eurasia here's a link for your convenience (US version, if your location is any indication you probably want the PAL version!))

it works with every model up to SCPH-101, SCPH-102 (the last PSOne revision) does NOT function with it (last I checked, that is).
It will work fine for all units you listed [to my knowledge, don't quote me on that].

I don't even think any other chips are made aside from the OneChip but that one's specifically for the SCPH-102 model and will definitely not work for fat playstations.


Oh, almost forgot. note: I'm not affiliated with eurasia in any way and cannot guarantee any quality of service - I'm merely stating that the modchip I bought from them worked fine a couple years back, should still work fine but YMMV and I take no responsibility for any information contained within this post and insert any other blurb here that'll prevent me from getting sued if it doesn't work.

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Post by Squaresoft74 » April 14th, 2016, 6:07 pm

Thanks for your answer, i'll go for that one then. :)

I don't think i'll keep all these units anyway.
I might only stick with the 1002 for collecting purpose and the 7502 ones since they're the last ones with the parallel port and their ksm 440-AEM drives seem to be the most reliable ones.

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Post by Squaresoft74 » April 23rd, 2016, 9:57 pm

I modded one of my PSone SCPH-102 PAL (v1 motherboard) with a OneChip (8 wires) and while it boots everything just fine i, for some reason, now have a black border on screen on the right side when using either RCA or S-Video cables.
But when using this RGB cable it doesn't happen and display correctly.

Is there anything i could have missed or done wrong ?

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Post by Shadow » April 23rd, 2016, 10:03 pm

Squaresoft74 wrote:I modded one of my PSone SCPH-102 PAL (v1 motherboard) with a OneChip (8 wires) and while it boots everything just fine i, for some reason, now have a black border on screen on the right side when using either RCA or S-Video cables.
But when using this RGB cable it doesn't happen and display correctly.

Is there anything i could have missed or done wrong ?
That sounds like a PAL/NTSC problem to me. Your TV mustn't support one or the other. Try playing a PAL game from RCA, and then an NTSC game. Do both regions have the black border on the right?
Development Console: SCPH-5502 with 8MB RAM, MM3 Modchip, PAL 60 Colour Modification (for NTSC), PSIO Switch Board, DB-9 breakout headers for both RGB and Serial output and an Xplorer with CAETLA 0.34.

PlayStation Development PC: Windows 98 SE, Pentium 3 at 400MHz, 128MB SDRAM, DTL-H2000, DTL-H2010, DTL-H201A, DTL-S2020 (with 4GB SCSI-2 HDD), 21" Sony G420, CD-R burner, 3.25" and 5.25" Floppy Diskette Drives, ZIP 100 Diskette Drive and an IBM Model M keyboard.

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Post by Squaresoft74 » April 23rd, 2016, 10:16 pm

It happens straight when powering on the console so also on the bios screen.
It didn't before i modded it and any cables worked just fine. :?

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Post by Shadow » April 23rd, 2016, 10:23 pm

Did you touch the RGB encoder by any chance?
It sounds like the modchip is putting your PSone into a mode which it doesn't support.
Development Console: SCPH-5502 with 8MB RAM, MM3 Modchip, PAL 60 Colour Modification (for NTSC), PSIO Switch Board, DB-9 breakout headers for both RGB and Serial output and an Xplorer with CAETLA 0.34.

PlayStation Development PC: Windows 98 SE, Pentium 3 at 400MHz, 128MB SDRAM, DTL-H2000, DTL-H2010, DTL-H201A, DTL-S2020 (with 4GB SCSI-2 HDD), 21" Sony G420, CD-R burner, 3.25" and 5.25" Floppy Diskette Drives, ZIP 100 Diskette Drive and an IBM Model M keyboard.

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Post by Squaresoft74 » April 23rd, 2016, 10:41 pm

I don't think i shortened anything as far as i or my multimeter can tell.
Maybe i should get some proper Kynar wire and redo the whole thing to make sure.

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Post by Shadow » April 23rd, 2016, 10:52 pm

Don't bother. The OneChip forces the console into NTSC mode. That's your problem :)
Makes complete sense now. That is why it works over RGB.
Development Console: SCPH-5502 with 8MB RAM, MM3 Modchip, PAL 60 Colour Modification (for NTSC), PSIO Switch Board, DB-9 breakout headers for both RGB and Serial output and an Xplorer with CAETLA 0.34.

PlayStation Development PC: Windows 98 SE, Pentium 3 at 400MHz, 128MB SDRAM, DTL-H2000, DTL-H2010, DTL-H201A, DTL-S2020 (with 4GB SCSI-2 HDD), 21" Sony G420, CD-R burner, 3.25" and 5.25" Floppy Diskette Drives, ZIP 100 Diskette Drive and an IBM Model M keyboard.

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Post by Squaresoft74 » April 23rd, 2016, 11:01 pm

Oh well as long as i have a proper RGB cable and use that one it's not really a problem then. :)
Thanks. !

*Edit*
Could this *fix* the problem ?
Looks like point 8 is different.

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Post by Shadow » April 23rd, 2016, 11:05 pm

No, point 8 looks like ground. You'd have to get the OneChip source, or dump the chip, change the video mode offset and re-flash the chip to fix it.

The HEX I beleive is this code here (this is the OneChip code for a SCPH-102 (PAL)).

Code: Select all

:0C0000002500FF0C0600820C0200F20A32
:100010004F084E08450863086808690870082008FA
:0C002000560831082E083008300820086F
:10008000030C2F00FF0C2E000008320C2A00C80CB5
:100090002B00A6076E00EB02490AEA02470A000895
:1000A000FD0C0600F90C26000008FF0C0600FF0CF2
:1000B00026000008FD0C0600F90C2600040C460A78
:1000C000FD0C0600040C2A00690C2B00FB0C4607F3
:1000D000F90C2600A6076E00EB02660AFB0C460729
:1000E000F90C26000000EA02640A00086D00040C06
:1000F00028001106880A4009120C3200040C460937
:10010000EF02850A0E06B00A4009F2027E0A8C0A46
:10011000480C4609FF0C2F000D02B1092C006C029F
:10012000090C2900960A2C030307980A60099A0A09
:100130005A090000EF029F0A0E06B00A4009E902C0
:10014000930A5A09EF02A70A0E06B00A40095A0993
:10015000EF02AD0A0E06B00A4009AD02E8028C0AB1
:100160000008E2015308430845084508640C4609A5
:10017000190C32000607CD0A640C4609500906071F
:10018000CD0A640C46095509F202BA0A500906065E
:10019000C70AFF0C06000000CB0A50091E0C2700FE
:1001A0004509E702D00AF90C2600FD0C0600070CF1
:1001B00027004509E702D90A220C3000E10A180C91
:1001C000300050090606E20AFF0C310076090606E7
:1001D000DF0AF002E60A50097100760950090606A6
:1001E000DF0AED0A140C33004509F302F40A66072E
:1001F000F70A86041D0C34004509F402FC0A660760
:10020000FF0A0000000000000000000000000000E5
:10021000EF0C06000000000000000000FF0C0600CC
:02022000B60A1C
:021FFE00EA0FE8
:00000001FF
Pop that through a PIC disassembler, and you should be able to find the correct offset, but it's PAL based anyway, so there wouldn't be a point :P
Development Console: SCPH-5502 with 8MB RAM, MM3 Modchip, PAL 60 Colour Modification (for NTSC), PSIO Switch Board, DB-9 breakout headers for both RGB and Serial output and an Xplorer with CAETLA 0.34.

PlayStation Development PC: Windows 98 SE, Pentium 3 at 400MHz, 128MB SDRAM, DTL-H2000, DTL-H2010, DTL-H201A, DTL-S2020 (with 4GB SCSI-2 HDD), 21" Sony G420, CD-R burner, 3.25" and 5.25" Floppy Diskette Drives, ZIP 100 Diskette Drive and an IBM Model M keyboard.

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Post by Squaresoft74 » April 23rd, 2016, 11:08 pm

Ok i'll leave it as is then, thank you very much. :)

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