22 Jul
2012
22 Jul
'12
12:05 p.m.
On 22 Jul 2012 at 11:38, Jon Elson wrote:
> I have successfully controlled some GPIB gear with just a parallel
> port, not even a pullup resistor needed.
Yes, it';s not difficult to bit-bang the handshake protocol. However, I
understnad that most modenr PCs don't have parallel ports any more, and
the USB-Cntroings pritner cables can't be used for this AFAIK. Yes, you
can make a USB-'user paralel port' interface and use that to talk to a
GPIB, but that;'s as much work as makign a specific interface.
Yes, it's possible, but it's very limited in
speed. and flexibility
See, for exmple, my 1987 SIMTEL program to drive an HPIB plotter
I ahve that around here if any wants it...
using a parallel port. I also seem to recall that the
Victor 9000
even had an optional GPIB cable to attach to the prallel port.
YEs, but the Victor 9000 pritner port was almost GPIB on the wrong conenctor.
The chips that drive it are a 75160 for the data lines and (IIRC) a 75161
(maybe 75162, I don't have the schematic to hand) for the cotnrol lines.
The Stb/ pin was drivine by the DAV buffer, etc. The hsot side of thsie
ships, the direction lines, etc were controleld by 6522s (what else,
given the dseigher...) maybe wit ha very small amount of extra logic.
You can easly do GPIB with that...
-tony