Hi! Thinking about this some more, we already have simple Z80 with RAM/ROM
circuits and 8255 PIA for I/O including circuitry for 8255 to IDE.
The only new element of this design would be converting a pair of 8255 PIAs
to SCSI-2. Looking at a pin out of a SCSI-2 pin out of the 68 pins, 34 are
grounds and a few more are power related. Basically it is about 30 pins
which actually do anything and of those 24 are data lines. This does not
appear to be a difficult interface to "bit bang" and would be somewhat akin
to the 8255 to IDE circuits.
Yes, performance would just OK and not fast. I think it would probably work
and be fairly cheap to make. I am willing to support other approaches but
would like to just help with the schematic capture, PCB design, and
prototype board development. The key to success is to keep it simple and
easily understood. Adding a bunch of unnecessary complexity just dooms the
project IMO.
Please contact me if interested. Thanks and have a nice day!
Andrew Lynch