HP-IB disc drive emulation program available

Tony Duell ard at p850ug1.demon.co.uk
Wed Dec 9 12:41:25 CST 2009

> On 8 Dec 2009 at 19:19, Tony Duell wrote:
> > I don't think a PC printer port can do that, can it? A Victor
> > 9000/Sirius printer port on the other hand...
> Depends on the device.  If you have a bidirectional printer port (or 
> hack a unidirectional one to be so) you can communicate with a 
> variety of GPIB devices, so long as you're not sharing the bus with 
> more than one device.

I thought you had enough outputs to have an ATN line, so you could do 
addressing. I think you can have multiple devices hooked up to a PC 
printer port pretending to be GPIB. But I don;t thinkl you can respond to 
paralell polls on the PC. I seem to remembr you are short of I/O lines, 
you can't have all of the bus control lines. Missing out EOI and SRQ is 
not a problem if you just wnat to talk to an HPIB plotter, it is a big 
problem if you are tryin to emulate an HPIB disk drive.

> Many years ago, I wrote a DOS TSR to drive a HP plotter with HPIB 
> interface from a PC XT with a bidirectional-hacked port.  It 
> redirected the BIOS printer service interrupt, so you installed 
> whatever software you had (in my case, SuperCalc) and told it you had 
> a parallel-interface version.
> I think I used a modified version of the software to later talk to a 
> HP voltmeter.
> It's probably still buried somewhere in the SIMTEL library.

If not, I have one of your GPIB-on-a-printer port programs here. It's the 
old one that uses an original PC printer port card with the well-knwon 
cut-and-jumper mod (why this isn't docuemtned in the IBM manuals is 
beyond me, the board is clearly laid out for it).


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