[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.
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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.

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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?

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

Post by Tonico » August 12th, 2020, 2:00 am

I tried doing the dual factory oscillator mod to my SCPH-1002 PAL PU-8 using NTSC components from a SCPH-3500 PU-8, but I no longer get a picture after doing the mod. Toggling the power button only results in a very brief white flash on monitor, reset button doesn't do anything.

I tried adding both caps from the back of the NTSC board to the PAL board instead of only using the one on the left side to match the NTSC model, but that didn't help. Any ideas what to try next?
2020-08-11 15.51.48.jpg
2020-08-11 17.00.35.jpg
Edit: This is looking like a fault with something other than that oscillator mod, reverted the console back to factory PAL configuration and the same issue persists. Going to do some testing with an oscilloscope later to see what the problem is.
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Re: [Hardware Mod] NTSC/PAL reference oscillator mod for PU-18

Post by TriMesh » August 17th, 2020, 4:36 am

My guess is that you accidentally shorted something and blew a fuse - they are the little black devices with reference designations starting with "PS" (Like "PS602") that are on the lower left corner of the board near the socket that connects to the power supply.

Try powering the unit up and checking for the same voltages on both sides of each fuse.

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

Post by khooy » September 4th, 2020, 6:39 am

i have soldered pal oscillator to japan 5500 board as described in pdf. and cut the trace because i have 5502 bios on 5500 board. now bios is running in ntsc mode with black borders up and down. so i little confused.
can problem be solved by installing 5501 bios, resoldering gpu trace or rgb-conponent cable? do i need pal-fix with external oscillator? will mayumi4 affect to video modes?

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

Post by TheDocz » September 4th, 2020, 6:32 pm

Hi, i have an PU-23 pal model, is this mod doable? and above all is it necessary or Sony fixed the later models?
Thanks.

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

Post by syntax » September 23rd, 2020, 2:33 pm

The original files linked by TriMesh for PU-8 are incorrect, the ferrite bead and resistor need swapping for install on a PAL unit.

The picture from Tonico is correct for resistor and ferrite bead positions.

If you look at Tonicos picture it seems that he did not need to remove the 0ohm link, the solder looks stock on those pads.
Id say he has a revision that links the outputs of both crystals somewhere else.
Checking with a multimeter on the either side of where the 0ohm link shows continuity for him I bet.

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

Post by SilentEyes » October 2nd, 2020, 4:50 pm

How do I install a DFO or add a second oscillator to my pu-7?

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