Max. 64K PRG ROM.
Max. 64K CHR ROM.
17677 NINA lockout replacement
This seems to be the first game SEI Released, and then AVE re-relased. It is the board from
Impossible Mission 2, which has 3 different cart cases that I know of. One's marked 'SEI'
and has a colour label, another is also marked 'SEI' but is just a black and white text label,
and the third if the AVE release. All three use an identical PCB and contain identical code.
There's what appears to be a pre-programmed microcontroller on the board running to a cap and
then to one of the lockout chip pins... most likely it just feeds these pulses to the chip
to disable it.
This cart maps 3 registers in at 7FFDh through 7FFFh. 7FFCh is decoded, but not used.
Select a 32K PRG page.
Select a 4K CHR page at 0000-0FFFh in PPU space
Select a 4K CHR page at 1000-1FFFh in PPU space
Cart has 8K of WRAM mapped in at 6000-7FFFh. Bank values are unknown on startup. Mirroring