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
