[Hardware Mod] NTSC/PAL reference oscillator mod for PU-18

General information to do with the PlayStation 1 Hardware. Including modchips, pinouts, rare or obscure development equipment, etc.
rama3
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Re: [Hardware Mod] NTSC/PAL reference oscillator mod for PU-18

Post by rama3 » January 15th, 2020, 9:06 am

Well, can you not modify any other $5 console instead?
It'd be a shame to do this to a debug station.

Anyway, the essential part is swapping the 53.2 oscillator for a 53.69 one.

kittykats
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Re: [Hardware Mod] NTSC/PAL reference oscillator mod for PU-18

Post by kittykats » January 15th, 2020, 9:40 am

Anyway, the essential part is swapping the 53.2 oscillator for a 53.69 one.
nothing else needs to be changed? just swap the one chip?

rama3
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Re: [Hardware Mod] NTSC/PAL reference oscillator mod for PU-18

Post by rama3 » January 16th, 2020, 4:21 am

Everything you need has been talked about in this thread already :)

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Shadow
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Re: [Hardware Mod] NTSC/PAL reference oscillator mod for PU-18

Post by Shadow » January 17th, 2020, 10:05 pm

The debug station isn't anything special. The only special parts on it is the blue plastic shell it comes in. The HC05 with the unlocked security can be re-created by flashing a new old stock chip :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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Re: [Hardware Mod] NTSC/PAL reference oscillator mod for PU-18

Post by aikawa24 » February 16th, 2020, 4:06 pm

@TriMesh Thank you very much for this Tut, ive managed it to mod my PAL 1002 to NTSC/PAL and can now finally play my Japanese DDR Games at AA :-) im very Happy

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Re: [Hardware Mod] NTSC/PAL reference oscillator mod for PU-18

Post by retroleah » March 27th, 2020, 12:57 pm

hey there :)

I have a similar tutorial on my website. How to have dual 53.2 and 53.69mhz GPU clocks for correct PAL and NTSC timings.

https://retrofreedom.com/ps1dfo.html

BY THE WAY:
On PU-22 boards and up, colour subcarrier is fixed regardless of oscillator fix. You also therefore need to mess with subcarrier if you want anything other than RGB. Otherwise you'll get PAL60 or NTSC50

EDIT:
ALSO:

Old old old PS1s with the 160-pin GPU only have 1 clock input.... 53.2 or 53.69 but not both. You could wire up a little switch to a 4066 (GND/3.3v switch) and switch out the oscillators accordingly (DFO auto-switch not possible on these PS1s since no NTSC/PAL switching pin on 160-pin GPU).

The reason for 4066 rather than switching the oscillations directly, is to reduce length of wire on oscillator wires (otherwise you'll cause lots of noise on the board)

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