IEEE-488 on the PDP-11

Aaron Jackson aaron at
Tue Nov 16 11:22:42 CST 2021

> In my pile of DEC computer stuff I have a DEC qbus IBV11 IEEE-488
> controller board (M7954) with cable (BN11-A) that connects to the GPIB bus.
> It would be interesting to try this out, but I don't have the DEC
> 'Instrument Bus Subroutines' that work under RT-11. Does anyone have
> this package? Or know where it can be found?
> Doug

I recently wrote a driver for the IBV11 card under 2.11BSD. I have it
talking to my scope and logic analyser without issue.

Not the cleanest code but my first try at writing a driver :-)


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