Re: Emulating A21 on 1DC0N or 2DC0N cx4 pcb (32mb romhack)
Posted: Fri Jan 26, 2018 9:15 am
Yeah, I didn't really intend to emulate it any differently than "normal" HiROM mapping, aside from the bank/ROM switching capability.lidnariq wrote:I think the bizarre HiROM layout is only a weird thing you need to emulate if you want to call the pins on the CX4 always the same thing regardless of how the mapping pin is strapped.
The same output pins always relay SNESA0-A14 and SNESA16-A19; the only difference is how those outputs are connected to the ROM's high address lines. The out-of-order-ness shown in qwertymodo's pinout (13 14 20 15 16) insinuates to me that the naïve map was intended to be HiROM and they did the simplest useful thing for LoROM compatibility.