11 Feb
2003
11 Feb
'03
5:15 a.m.
Careful: the M9312 is for the CPU end of the bus, and
besides the
near-end termination, it provides for diagnostic and boot ROMs, so it is
*not* a replacement for the M9302, but it's counterpart for the other
end of the bus.
As such, the M9312 goes into a MUD slot (*modified* UNIBUS device),
which has some pin designations differ from a *standard* UNIBUS slot,
which is the reason why the regular terminator (M930 or M9302) needs to
go into the last (=standard) slot, not anywhere in between. Hence, the
M9312 (designed for MUD slots) must NOT go into the last slot for the
same reason.
An M9312 will work just fine in a normal Unibus slot at the far end.
However, you are correct that this is now how the 11/44 is supposed
to be configured.
The near-end Unibus terminator slot is NOT an MUD slot. On an 11/44
it does have a few signals different than a normal Unibus slot, but
they are different than a MUD slot also.