[Coco] ROM Cart registers

[Robert Gault]

RETRO Innovations wrote:
> Does anyone know the specifics on the SuperIDE, Cloud-9 FLASH cart, or CocoSDC
> FLASH register layout?
>
> I know the bottom 2 bits of $ff59 (default) on teh SuperIDE and the Cloud-9
> FLASH cart are the bank register, but not much else as yet.
>
> Anyone?
>

This is not exactly what you asked but could be a compatibility issue.

Your cart uses $FF58-$FF5C for control registers. This overlaps the alternate 
SCII control registers for the Disto Super Controller.
So with an MPI holding both an SCII disk controller, a Ken-Ton SCSI interface, 
and your ROM cart, there will be conflicts in Disto no-halt mode as the Ken-Ton 
uses $FF74-$FF77 forcing the SCII to use $FF58-$FF5F.

The SCII both reads and writes at $FF58-$FF5F so one or both units (SCII/ROM 
cart) would get bad data without very careful handling of the MPI $FF7F values.

Robert