Adding floppy drives to my PDP-11?

Glen Slick glen.slick at
Sun Apr 14 01:47:54 CDT 2019

On Sat, Apr 13, 2019 at 3:07 PM Charles via cctalk
<cctalk at> wrote:
> What about smaller drives (RX50? RX33?)... can those be interfaced to the
> 11/23+ Qbus?

Pick up a common as dirt M7555 RQDX3. If you don't have a BA23 with
the built in distribution board for the M7555 RQDX3, then pick up an
M9058 distribution board to break out the signals from the M7555

For example, this one which is incorrectly listed as an M9056:

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