On 2/13/25 18:52, Paul Koning via cctalk wrote:
The later parallel ports include several faster modes than the original one. The best of
these is "EPP" mode which is fully bidirectional, with interlocked high speed
handshakes. I think you can get fairly close to (original) Ethernet speeds with those.
I once built a software-defined radio using one of those for its baseband data/control
interface, it worked quite well. The state machine fits in a small CPLD (Lattice
isp2032).
I'm pretty much an expert on EPP mode operation. (I make a
line of CNC motion control boards that interface to the PC
via EPP-mode parallel port.) Mostly, you can get up to
about 1 mbyte /second with this.With no cable between the
external device and PC, it might go a little faster.
Jon
