Akira MMC3 patch on real hardware [SOLVED]

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UniKennY
Posts: 3
Joined: Sun Aug 02, 2020 6:15 am

Akira MMC3 patch on real hardware [SOLVED]

Post by UniKennY » Sun Aug 02, 2020 6:21 am

Hi Community

I'm trying to make an Akira translated with Mottzilla MMC3 applied
Rom is working fine on Mesen.

Donor is Bugs Bunny Birthday Blow Out (TSRom with 8K of WRAM)

Eeprom used are SST29SF020

CHR
Image

PRG
Image

Pretty easy to do, but i do have a grey screen...

Did someone already success on this one ?

Thanks
Last edited by UniKennY on Mon Aug 03, 2020 11:10 am, edited 1 time in total.
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Ice Man
Posts: 546
Joined: Fri Jul 04, 2014 2:34 pm

Re: Akira MMC3 patch on real hardware

Post by Ice Man » Mon Aug 03, 2020 3:34 am

The MMC3 conversion is working fine on real hardware.
Make sure you connect the SST39SF020 properly as in connect /WE to VCC and don't leave any inputs floating.

PRG:
Pin 1 -> NC
Pin 2 -> Hole 24 (A16)
Pin 24 -> GND
Pin 30 -> Hole 1 (A17)
Pin 31 -> VCC (/WE)

CHR:
Pin 1-> NC
Pin 2 -> Hole 24 (A16)
Pin 22 -> Hole 31 (/CE)
Pin 24 -> Hole 2 -> (/OE)
Pin 30 -> Hole 1 (A17)
Pin 31 -> VCC (/WE)
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UniKennY
Posts: 3
Joined: Sun Aug 02, 2020 6:15 am

Re: Akira MMC3 patch on real hardware

Post by UniKennY » Mon Aug 03, 2020 11:10 am

I finally used my two last 27C2001 to make it.
Thanks for your answer ! Will take it in account for future repro.
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