My apologies to DXA71 for not realizing that the GPIB-HP700-EISA was not a board, but a kit. If I had read the text from the catalog entry for the GPIB-HP700-EISA, I would have realized that:
"The GPIB-HP700-EISA is a high-performance IEEE 488.2 interface kit for HP 9000 Model 700 Series workstations equipped with EISA slots. The GPIB-HP700-EISA includes the EISA-GPIB interface board and NI-488.2M software for HP-UX."
So the correct answer to the original question is that the EISA-GPIB board IS supported by the GPIB drivers for HP-UX (the driver mentioned in my original reply).
Again, my apologies. Thanks to Ryan M for providing the correct answer.
Dieter Schweiss