Hey,
would I be wrong in thinking the CE chip enable signal on the cartridge port is the same as ROMEN on the expansion bus...
I mean, the stock firmware works on a CPC+ so it seems like it's got to be the same thing
The schematic seems to have NROM going to the CE chip so it's not actually connected to ROMEN.. but it should work the same?
I would expect that ROMEN is triggered whenever NROM is triggered - but not the other way around.
sounds close enough!
the idea I had was, use a Z80 shim to extract the cpu signals and wire it to a ROM chip containing the firmware and connect CE to the OE of the ROM. Turn it into a CPC
Why would you need to do that? The firmware ROM is in the cartridge on Plus machines (and by extension the GX4000 if you put a Plus BASIC cartridge in). It's the lack of keyboard that stops you just running BASIC...