NES-CNROM




Cartridge Board


What Is It?

A discrete logic Nintendo-made board.
Max 32K of PRG ROM
Max 32K CHR ROM
74161.
Note: this board has bus conflicts.



The Tech:

The LS161 acts as a latch. It latches D0 and D1. Writing anywhere in the 8000h- FFFFh range will set this latch using the above data lines.
7  bit  0
---- ----
xxxx xxCC

The C bits select an 8K CHR ROM page.


Mirroring is hardwired on the cart.


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