On 11/28/2005 at 10:46 AM Dwight K. Elvey wrote:
  Besides the HeathKit hard sectored controller board,
used on both the H8 and the H89, Polymorphics also
used a serial chip to do data. In both of these
cases, as you state, they used synchronous serial
chips and not async. 
To put a reverse twist on this, has anyone ever used two floppy controllers
to transfer data between two systems?  I know it'd take a little extra
hardware (something has to provide address headers outside of a format
operation), but it should still be quite possible to do so.
I've never tried, however.  Ethernet is so much easier.
Cheers,
Chuck