[Coco] A year in review at Cloud-9

[CoCoList for Color Computer Enthusiasts]

<coco at maltedmedia.com> wrote:

>
> The conflict comes because the FDC doesn't completely decode its addresses
> so the FF40 register appears at FF41 through FF47 as well. If the FDC was
> integrated into the device as on the FPGA, or specifically designed not to
> conflict (as on emulators), there would be no problem since the device
> itself would decode things properly. As it stands, however, you would have
> a bus conflict between the FDC and any other external device because both
> devices would respond to those addresses.


The floppy controllers need the SCS* signal for their decoding. If you have
more than one external device connected, chances are you have them in a
Multi-Pak Interface. The MPI routes the SCS* signal to only one device at a
time so there shouldn't be any conflicts. You do need to use software that
knows how to activate the proper MPI slot for the device it is targeting.

If you are using a Y cable instead of an MPI then you have a problem.

Darren