6 Sep
2016
6 Sep
'16
9:58 p.m.
From: Jules Richardson
M8190-AE ; 11/83 CPU
M8190-AB ; 11/83 CPU (or /73??) w/FPU
As far as I know, all the M8190's are _basically_ the same: they are the
KDJ11-B CPU, which support the PMI memory bus, can operate with a KTJ11-B to
provide a UNIBUS, etc. They are the CPU in an 11/83 (with QBUS only
backplane) and the 11/84 (with QBUS/UNIBUS backplane).
The various models of the M8190 vary in details (e.g. although all have a
socket for the FPJ11 floating point accelerator chip, the earlier ones don't
work properly with it), including the clock speed (15/18 MHz, etc).
The 11/73 uses the KDJ11-A M8192, a completely differente card.
Noel
6 Sep
6 Sep
10:32 p.m.
On 09/06/2016 08:58 PM, Noel Chiappa wrote:
I got the /73 reference from a post of Pete's last year:
http://www.classiccmp.org/pipermail/cctech/2015-February/002612.html
... but I' m guessing he just meant that the slower ones work at the same
speed as a true /73?
Unfortunately there aren't any markings on the crystal on the -AB board
(well, there probably are, but on the underside and it would have to be
desoldered) so I don't know if it's a 15MHz or 18MHz part.
J.
From: Jules
Richardson
M8190-AE ; 11/83 CPU
M8190-AB ; 11/83 CPU (or /73??) w/FPU
As far as I know, all the M8190's are _basically_ the same: they are the
KDJ11-B CPU, which support the PMI memory bus, can operate with a KTJ11-B to
provide a UNIBUS, etc. They are the CPU in an 11/83 (with QBUS only
backplane) and the 11/84 (with QBUS/UNIBUS backplane). 
7 Sep
7 Sep
4:58 a.m.
On 07/09/2016 03:32, Jules Richardson wrote:
On 09/06/2016 08:58 PM, Noel Chiappa wrote:
> As far as I know, all the M8190's are
_basically_ the same: they are the
> KDJ11-B CPU, which support the PMI memory bus, can operate with a
> KTJ11-B to
> provide a UNIBUS, etc. They are the CPU in an 11/83 (with QBUS only
> backplane) and the 11/84 (with QBUS/UNIBUS backplane).
I got the /73 reference from a post of Pete's last
year:
http://www.classiccmp.org/pipermail/cctech/2015-February/002612.html
... but I' m guessing he just meant that the slower ones work at the
same speed as a true /73?
Well, in a sense the slower ones /are/ 11/73s. By that I mean that all
the microPDP-11/73s that DEC sold were (AFAIK) running at 15MHz and all
the 15MHZ boards were sold as 11/73s - but all microPDP-11/73 machines
had an M8190. The M8192 was mostly sold as an OEM board.
Don't believe (let alone rely on) the Wikipedia article about the
PDP-11/73 - it's just wrong.
Unfortunately there aren't any markings on the
crystal on the -AB board
(well, there probably are, but on the underside and it would have to be
desoldered) so I don't know if it's a 15MHz or 18MHz part.
Look at the ROMS; if they're really early ones it's probably a 15MHz board.
--
Pete
Pete Turnbull
2875
days inactive
2875
days old
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jnc＠mercury.lcs.mit.edu -
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pete＠dunnington.plus.com