Something similar to that would be appealing for my
Epson PX-8.
It shouldn't be hard to do (famous last words). The hardware interface is
a simple asynchronous serial interface running at 38400 baud and at RS232
levels. The Epson seiral drive protocol is pretty well documented, I am
pretty sure I found the documetation on the web, along with some other
Epson manuals
I know I found a program for linux machines that emulates an Epson drive.
It even runs on my ancient PC.
The original Epson TF20 floppy was ridiculously over-complex. There's a
Z80A in there with 64K RAM and a boot ROM that's switched out after
booting. I boots a hacked version of CP.M from the master disk (!). The
serial port uses a 7201, etc. In other words that hardware could do a lot
more than is needed for this application. Later Apson drives, like the
PF10, are simpler (a 6303 + EPROM + 2K RAM + FDC, basically).
-tony
Allison