Mega Girl Another Fight Story (Mega Man 1 Hack)

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Mega Girl Another Fight Story (Mega Man 1 Hack)

Post by krzysiobal » Tue May 12, 2020 3:43 pm

I got this broken cartridge for check & dump. It reminds me in design this one. There is place to solder PRG-ROM, CHR-ROM (or CHR-RAM), two blobs, one unknown SO14 chip and a lot of jumpers.

* The pinout of top, unpopulated blob (let's call it U4) is exactly like the AX5202P, without WRAM and PRG-A18 pins). There are also extra pins wired to it: CPU-A12, CPU-A2, CPU-A1 (wonder which mapper can take use of them - JY Company?), and two input pins (mode select?)

* The pinout of bottom, populated blob chip (let's call it U5) is:

Code: Select all

 CPU D0 -> |   | -- +5V
 CPU D1 -> |   | -> PRG /CE
 CPU D2 -> |   | <- M2
 CPU D4 -> |   | <- CPU A14
PRG A14 <- |   | <- CPU R/W
PRG A15 <- |   | <- CPU /ROMSEL
PRG A16 <- |   | -- GND
PRG A17 <- |   | -> CIRAM A10
which reveals that the blob inside can mimic either UNROM or ANROM

* The unpopulated bottom SO14 chip is meant to be 74*74 - its output would change every reset to allow 2 different games

It turns out the PCB is quite versatile - it allows to be used as:
* NROM (no extra chips need to be present)
* MMC3 (U4)

Unfortunately the mapper blob is broken, but EEPROM was good. It holds the Mega Girl Another Fight Story game.

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Mega Girl Another Fight Story [apply over Mega Man (U)].ips
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