plugged into the PDS slot, it also runs to a strange 24(?) pin D style port on the back of the case, looks like a mini centronics port. The board itself is marked: National Instruments ASSY180390-01 REV.D1 S/N 01671. The board is about half the size of the motherboard. One jumper on the board, just says DMA I think, any clues ?
Sounds a lot like a GPIB (General Purpose Interface Board). They were used to make measuring instruments out of a computer or to set up automatic switching devices. I have a NuBus GPIB that came with a IIcx, along with a thick manual by National Instruments about how to program it in BASIC. As programming isn't my cup of tea, I never took too much care of it. If you are really interested to put it to some use I can make a copy of the manual and mail it to you if I ever find it again. Sorry, can't make PDFs.
Chers, OM
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