23 Mar
2005
23 Mar
'05
12:07 p.m.
Fred wrote:
The even/odd numbering is only valid for the later
systems.
It's perfectly simple. If you're not getting your hair cut, you don't have
to move your brother's clothes down to the lower peg. You simply collect
his note before lunch, after you've done your scripture prep, when you've
written your letter home, before rest, move your own clothes onto the lower
peg, greet the visitors, and report to Mr. Viney that you've had your chit
signed.
Oops, strike that. I meant: It's perfectly simple. The models
that end in "3" are Qbus.
Also, an 11/83 is not a hybrid, its a QBus CPU, and
system. You meant
to say 11/84, which has the same CPU, and a Unibus bridge board.
Note that while the KDJ11-B CPU is used in both Qbus (11/83) and Unibus
(11/84) systems, that when installed in an 11/84, it does NOT use Qbus.
The processor bus in an 11/84 is similar but NOT identical to Qbus.
There is a signal on the PMI connector that tells the KDB11-B which
type of system it is installed into, and thus which kind of bus to use.
Thus the KTJ11-B bridge is NOT a Qbus-to-Unibus bridge, but rather a
KDJ11-B-special-bus-to-Unibus bridge.
Eric