15 May
2007
15 May
'07
5:44 a.m.
Roger Ivie wrote:
On Mon, 14 May 2007, Pete Turnbull wrote:
I think you're both right. There are 2 different 11/84 chassis. If
I remember right, one has the Qbus-Unibus adapter in the far-end slot,
and the other is between the Qbus and Unibus slots.
It's been a while since I had either one open, though, so I might be
smoking crack.
Doc
On 14/05/2007 21:02, Roger Ivie wrote:
It's been a long time for me, too. You could be right. The 11/84 used a CPU board without memory. The
memory was in the slots
between the CPU board and the UNIBUS adapter, communicating with the CPU
board using a private memory interconnect protocol.
It doesn't need a ribbon cable, but PMI uses the CD-interconnect
instead of the QBus, and the memory has to be in a higher slot
(physically, that is; ie a lower-numbered slot) than the CPU. I
thought the Unibus adapter went below the CPU. However, I've only met
an 11/84 once, and that was a long time ago, so I can't be sure about
the Unibus adapter placement.