MMC3 clone labeled 88

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Fisher
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MMC3 clone labeled 88

Post by Fisher » Tue Dec 26, 2017 2:02 pm

Finally I could have a timeframe enough to finish my MegaMan 4 repro!

Some pictures of the monstruosity:
MM4 Comp
MM4 Comp
MM4 Solda
MM4 Solda
Altough very similar to the stock MMC3, I couldn't find this clone's pinout anywhere.
So, I think it would be nice to share it here:

Code: Select all

                  .--\/--.             
   (r) CHR A13 <- |01  40| <- PPU A10 (f)
   (r) CHR A14 <- |02  39| <- PPU A11 (f)
   (r) CHR A12 <- |03  38| <- PPU A12 (f) 
 (f) CIRAM A10 <- |04  37| -> CHR A10 (r)
   (r) CHR A15 <- |05  36| -> CHR A16 (r)
   (r) CHR A17 <- |06  35| -> CHR A11 (r)
      (f) /IRQ <- |07  34| -> PRG RAM /WE (w)
   (f) /ROMSEL -> |08  33| -> PRG RAM +CE (w)
           GND -- |09  32| -- GND
       (f) R/W -> |10  31| <- CPU D3 (fr)
   (r) PRG A15 <- |11  30| <- CPU D2 (fr)
   (r) PRG A13 <- |12  29| <- CPU D4 (fr)
   (f) CPU A14 -> |13  28| <- CPU D1 (fr)
   (r) PRG A16 <- |14  27| <- CPU D5 (fr)
   (r) PRG A18 <- |15  26| <- CPU D0 (fr)
   (f) CPU A13 -> |16  25| <- CPU D6 (fr)
   (r) PRG A17 <- |17  24| <- CPU A0 (fr)
   (r) PRG A14 <- |18  23| <- CPU D7 (fr)
   (r) PRG /CE <- |19  22| -> PRG RAM /CE (w)
           VCC -- |20  21| <- M2 (f)
                  '------'             
The small IC is a demux I made with an LS00, and yes, the IC is labeled "LS00":
LS00
LS00
07af0a06-8dfc-4ced-9e77-5dafc4026b48.jpg (8.56 KiB) Viewed 9248 times
Hope this can help someone else in the future!

krzysiobal
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Location: Poland

Re: MMC3 clone labeled 88

Post by krzysiobal » Thu Dec 28, 2017 7:03 pm

I've found it in Super Mario Bros 5 (SMB3 hack). WRAM +CE and /WE from your schematics are reversed.

Image Image Image Image

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Fisher
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Re: MMC3 clone labeled 88

Post by Fisher » Fri Dec 29, 2017 4:38 am

That's great! Thanks for the correction.
Could you please add this pinout to the wiki?

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Fisher
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Re: MMC3 clone labeled 88

Post by Fisher » Sat Feb 24, 2018 11:28 am

Found another board with this clone.
Unfortunatelly the ROMs aren't working and I don't know what game it is.
I also doubt the 88 clone is alive too.
I'm asking myself what a 7404 would be doing there!!
The p0rn pictures:
Solda
Solda
Componentes
Componentes
The IC's names were mostly erased, I could barely see an 88 printed on the mapper.
I just imagine in the depths of where it came from!!

krzysiobal
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Joined: Sun Jun 12, 2011 12:06 pm
Location: Poland

Re: MMC3 clone labeled 88

Post by krzysiobal » Sat Feb 24, 2018 11:41 am

I'm asking myself what a 7404 would be doing there!!
It's for generating chip enable signal for DIP28 128k mask rom with single chip select line which, in this pcb, is activated with high logic level.

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Fisher
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Re: MMC3 clone labeled 88

Post by Fisher » Sat Feb 24, 2018 11:46 am

Interesting...
Seems a bit odd!

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