On Tue, Apr 23, 2019 at 10:20 PM Mike Loewen via vcf-midatlantic <vcf-midatlantic@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) Qbus M7946 RXV11 M8029 RXV21 Unibus M7846 RX11 M8256 RX211 OMNIBUS M8357 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. -ethan