[Info-vax] Y3K for PDP-11 Operating Systems

[G Cornelius]

Bob Koehler wrote:
>    The FPA for the VAX-11/780, and I believe for the 785, was part of
>    the data path between RAM and CPU.  When the CPU fetched and
>    instruction that was implemented in the FPA, the FPA executed it,
>    presented an instruction to store the result, and padded with NOPs
>    to maintain instruction alignment.

It is interesting that in the EV4 Alphas, at least, you could consider
floating point and load/store as a single unit, in that when issuing
instructions - the EV4 was dual-issue - only one load/store/FP class
instruction could be issued in a clock cycle, but it could be issued
simultaneously with, say, an integer arithmetic instruction.

George