14 May
2007
14 May
'07
8:20 p.m.
On 14/05/2007 09:01, Rod Smallwood wrote:
All of your points are well made. One is very
important the KDJ11-EB has
its memory on the CPU board. Are you saying some models of the KDJ11 do
not have their memory on the CPU board? Is it a case of unpopulated
sockets and add memory or is it no sockets and no memory?
KDJ11-E (M8981) is a quad-height board used in 11/93 and 11/94, running
at 18MHz, with up to 4MB of RAM on board. It also has a floating point
processor, boot ROMs, line time clock, and 8(?) serial ports.
KDJ11-D (M7554) is a quad-height board used in 11/53, usually running at
15MHz, with either 512KB or 1.5MB of RAM, boot ROMs, LTC, and 2 SLUs.
It's one of the slowest KDJ11s; the 11/53 was meant as a low-cost
system. The same board, but with different ROMs and different handles
(KDJ11-S), was used in some tabletop systems.
KDJ11-B (M8190) is a quad-height board with no RAM (and no sockets for
it), but with boot ROMs, LTC, and 2 SLUs. It was available as 15MHz for
the 11/73, and 18MHz for the 11/83 and 11/84. 18MHz versions normally
included the FPJ11 floating point processor chip; 15MHz usually merely
had the socket; some early 15MHz versions won't accept an FPJ11 chip.
These boards will work with PMI memory as well as with ordinary QBus memory.
KDJ11-A (M8192) is a dual-height board clocked at 15MHz, with no RAM,
boot ROMs, LTC, SLUs, or other embellishments. In other words, it's
just a CPU. Used in a few 11/73S systems, as an OEM board, and for
11/23 upgrades. Early revisions won't accept an FPJ11 chip.
See Micronotes 25, 30, and 39.
--
Pete Peter Turnbull
Network Manager
University of York