Ethan Dicks said:
> If they can take it, you'd need a DWBUA on a VAXBI bus (there is no
> Unibus adapter for XMI). ISTR when the 6000 was current that DEC
> imposed a limit on how fast a machine could take a DWBUA, not to
> screw the customer, but because some of the (then) newer machines
> had so many layers between the Unibus peripherals and memory that
> timings could not be maintained.
I am aware of an application that used a Unibus on a VAX 6520. The
system would occasionally spontaneously crash; it looked to me like
the UNIBUS adapter was getting wedged. Rumor has it they fixed it
with a microcode upgrade to the DWBUA, but I doubt that microcode
was ever made generally available.
--
Roger Ivie
ivie_at_cc.usu.edu
Received on Sat Oct 19 2002 - 19:23:21 BST