5 Feb
2015
5 Feb
'15
6:22 a.m.
On 2015-02-05 15:00, Pete Turnbull wrote:
I don't believe that's true. It's certainly not true in an 11/73 or
11/83, and I suspect the idea comes from one of the 11/84 manuals, which
only mentions one type of card (half- or fully-populated).
Yup.
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
On 05/02/2015 13:10, Noel Chiappa wrote:
Yes, and no.
You should plug in a MLM if you haven't fully populated the slots.
They are not wired up as Qbus slots.
The 11/84 backplane has two special Q22/CD slots
after the processor slot
which the memory goes in, with the CD sections wired to
through-connect the
PMI pins.
I have this sneaking suspicion that the Q22 portions of those two
slots aren't
_real_ QBUS slots (so you can't plug a QBUS device into them if you
aren't
using them for memory :-), because I suspect they didn't run BIAK and
BDMG to
those slots, but rather piped them directly to the UNIBUS adapter
slot. My
reasoning for that is that if you don't plug in a memory card in one
of those
slots, you don't have to plug in a grant continuity card, so....
But you're supposed to plug in a Minimum Load card, aren't you? I
wonder if those slots would work for a non-DMA device. I seem to remember that when two memory boards are
used, they
should be
the same.
Really? That would surprise me.