Modchip suggestion for PSOne with bios 4.1

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Squaresoft74
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Modchip suggestion for PSOne with bios 4.1

Post by Squaresoft74 » March 18th, 2019, 2:59 am

Hello,

I made a bios swap in one of my Scph-102 (PM-41) machine with one from a 9002 (v4.1).
Done it for fun and not only because i prefer its UI, but it also doesn't have the extra region check.

So i was wondering which modchip you would suggest for such setup ?
I take it that OneChip isn't required anymore since there's no more bios patch to apply so should i use MM3, Mayumi or still a OneChip because of the motherboard ?

Thank you.

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Re: Modchip suggestion for PSOne with bios 4.1

Post by damiank94 » March 18th, 2019, 8:44 am

I think that You can still use ONEchip, just without patching BIOS as it was designed for PSone. Also only six wires for stealth instead of 7 or 8.

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Squaresoft74
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Re: Modchip suggestion for PSOne with bios 4.1

Post by Squaresoft74 » March 27th, 2019, 3:52 am

Thanks i'll try that.
Still i was wondering if one was better than the others.

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TriMesh
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Re: Modchip suggestion for PSOne with bios 4.1

Post by TriMesh » March 27th, 2019, 4:51 am

Squaresoft74 wrote:
March 27th, 2019, 3:52 am
Thanks i'll try that.
Still i was wondering if one was better than the others.
They are all pretty much equivalent in this application - the part of the code that carries out the actual modchip function is the same. For a non-PAL console, there is no need to connect the wire from pin 3 of the PIC to the boot ROM since you don't need the patch function.

For Mayumi or MM3, you can just install them as normal except for pin 4 - this normally goes to the reset switch and since the PSone doesn't have one you need to wire it to the same place that pin 1 goes to.

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Squaresoft74
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Re: Modchip suggestion for PSOne with bios 4.1

Post by Squaresoft74 » April 6th, 2019, 1:08 pm

Thanks for the infos TriMesh.

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