Steven Hirsch wrote:
Sounds like I should blow the dust off of the software and drivers...
Good idea!
I looked at the disassembly of the bootstrap ROM and apart
from obvious things there are a lot of mystery routines. I ran it
on the FPGA model and sure enough it sends 'Z' to the Apple side.
Waits for a long time ( 15 seconds or so ) for input from Apple
and then goes into an endless cycle sending a different byte several
times a second to the interface. It also reads the port $E0 that is
decoded to a chip select on the external connector that is not supposed
to be wire to anything. Maybe just a scope strobe for debugging?
I was able to dig up one good article about how it works on the software
side. A file called STARCPM.IMG from the A2.CPM.COLLECTIONS has a
document STAR.DOC describing the software interface between Apple and
the Applicard. I'll use that for testing.