Noel Chiappa jnc at
Sun Jul 1 07:11:51 CDT 2018

    > From: Paul Birkel

    > Same thing in this case. 

The CPU looks to see a PMI signal that is generated by the KTJ11 - no signal
-> 11/83.

My impression is that except for the speed of the J11 (and the crystal), and
whether or not it came with the FPJ11, all four of the M8190 board variants
are otherwise identical. Whether it's a /73, /83 or /84 depends entirely on
whether it has/sees PMI memory and the KTJ11-B UNIBUS converter (and the
correct backplane, for the latter, of course).

    > The 11/84 is an 11/83 extended by a Unibus interface to support legacy
    > peripherals.

It has a special backplane which is mostly UNIBUS slots, with a few QBUS/PMI
slots on the front, and a 'special' slot in the middle into which the UNIBUS
adapter goes.


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