For my own education purposes I have been using my multimeter to map out a bunch of different PCBs. I have a copy of Black Bass III (Jap) which uses a 1A3M-30 PCB. Here is the pinout of the MAD-1 as I can tell with my meter:
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MAD-1:
X---------|1 {/RomCS1} {/RomCS0} 16|---------X
SRAM /CS1-|2 {/SramCS} {Addr0} 15|-------A15
X---------|3 {/AuxCS} {Addr1} 14|-------A20
ROM /OE---|4 {/RomCS} {Addr2} 13|-------A21
SRAM Vcc--|5 {Vout} {Addr3} 12|-------Vcc
Vcc-------|6 {Vcc} {/CART} 11|-----/CART
R1--------|7 {Vbat} {MODE} 10|-------GND
GND-------|8 {GND} {/RESET} 9|----/RESET
Is it something to do with the fact that this is a 32Mbit ROM? There is some weirdness with LoRoms of this size since the last bit of ROM cannot be accessed in the lower half of the memory map (because WRAM is mapped in the 7E-7F banks I think) so you have to look for it in the upper mirror (FE-FF).