[vcf-midatlantic] DEC PDP 11/03-AA for sale

Ethan Dicks ethan.dicks at gmail.com
Tue Apr 23 23:52:50 EDT 2019

On Tue, Apr 23, 2019 at 10:20 PM Mike Loewen via vcf-midatlantic
<vcf-midatlantic at lists.vcfed.org> wrote:
>     I have a PDP 11/03-AA available for sale, which I will bring to VCF East.
> This CPU was used as the console of a VAX 11/780, and includes an RX01 floppy
> drive and cables...

>     About the floppy drive...the M7946 is a RX01 controller, but the part
> number on the drive itself is for an RX02.  I know practically nothing about
> DEC hardware, so I don't know why the discrepancy.

There are 5 DEC drive interface boards for three DEC busses, two Qbus,
two Unibus, and one OMNIBUS (this does not count later DECmate systems
which use RX02 drives but don't have an OMNIBUS)

  M7946 RXV11
  M8029 RXV21

  M7846 RX11
  M8256 RX211


The RX02 drive has a 2-position DIP switch on the boards for selecting
one of the following modes:

S1-1 OFF S1-2 ON - RX211, RXV21 controller (RX02 mode)
S1-1 ON S1-2 OFF - RX11, RXV11, RX8E controller (RX01 mode)
S1-1 OFF S1-2 OFF - RX8E, DECmate (RX02 mode)

The RX01 drive only works with the RX11, RXV11 and RX8E.


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