Hi all,
not sure if it can be thought better as a software
or hardware topic, however...

I'm attempting bi directional communication with a
printer with no success (what that means ? Simple, I
send the printer some command which implies a reply,
that's really low level, technical stuff, don't care
of it... ;)

I firstly tried with an UPAR: assign created with
the port-handler, either connecting the printer to
the parallel port (via parallel.device) then connecting
it to USB (via usbparallel.device). No reply, wait
forever.

Then I went the low level way using the device
read and write commands: with the parallel port
the read command returns -3 (unsupported command).
Oh well... so I searched the web and found that
Pegasos parallel port is stuck to uni directional
mode. Is that true ? Well, at least 2+2 makes 4
(a sad 4, I would say).

Doing the same with the printer connected to USB
and using the usbparallel.device, the read command
never returns. I assume my communication protocol
is correct (even if taken by reverse engineer a
PC port sniffing...). Should I think that
usbparallel.device is some way broken too ??
I need know that, because atm I can't figure out
until which point it's me and until which it's the
hardware/OS failing.

(My config is PegII with MOS 1.4.5)

Thanks for any in-topic hint and answer!
/&