MicroPDP-11/73, was Re: More mystery recycler boards - DEC, Fujitsu(??), Cipher, Emulex

Steven M Jones classiccmp at crash.com
Wed Sep 7 14:20:37 CDT 2016

On 09/07/16 05:02, Noel Chiappa wrote:
> The other thing that makes no sense is that the KDJ11-B (M8190) has all that
> extra circuitry on it to support PMI, etc - all of which is unused in the
> 11/73 application! Why not just plug in a (presumably cheaper) M8192?

In Marketing-land, the VAXstation II RC, with epoxy in the
factory-unused slots, makes sense...

On 09/07/16 07:34, Pete Turnbull wrote:
> Don't forget the LTC :-)  All in all it saves a decent amount of
> backplane space, makes field service easier, and follows DEC's attempts
> to integrate as much as possible.  Otherwise, you'd need an additional
> bootstrap card such as an MRV11-D with -B2 boot ROMs, a DLVE1 (DLV11-JE)
> for the SLUs, something with an LTC, and termination.  That's at least
> twice as many slots in a Q-Q backplane and four slots in Q-CD.

I think this makes sense in Engineering-land, good point. ;)

Anybody know what the most common actually-shipped configuration of the
MicroPDP-11/73 were? BA23, M8190, 1 RAM board, RQDX_, and DLV11?


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