On 2020-06-22 4:43 p.m., Achim Buerger wrote:
The 9920 service manual states as possible OS the 98670 / 98689 HP-UX 2.0.
It seems that the 9826, 9836, and 9920 all use the same CPU cards
and there are two types, the original 68000 based card that also
has 128K of memory on it and then the 68010 based card which has
the memory replaced by a HP designed Memory Management Unit
(MMU). It would seem that the 09836-66510 and 09826-66516 are
both the 68000 card with 128K of memory. I seem to recall that
V5.1 of HP-UX needs a MMU to function.