[Info-vax] Attaching an actual 3.5" floppy drive to SIMH-VAX RXV21 device?

[Stephen Hoffman]

On 2012-08-14 22:09:08 +0000, Johnny Billquist said:

> On 2012-08-14 16:10, Steven Schweda wrote:
>>> Are you sure it was a VAXStation? [...]
>> 
>> Did I say "VAXstation"?  Oops.  More likely a MicroVAX I.
>> (Not that it matters much here.)  It was a BA23 box.
>> 
>>> [...] We are talking VAXStation here.  That's a desktop
>>> pizza box. Not a QBUS system.  No where to put an
>>> RQDX-anything and no room for a drive the size of the RX50.
>> 
>> No.  "VAXstation" is not equivalent to "VAXstation 31xx".
>> There were several different Q-bus VAXstation system types.
>> (Roughly one per MicroVAX system type.)
> 
> How fast people forget. There was both the VAXstation I and the 
> VAXstation II. Same machines as the MicroVAX I and MicroVAX II, but 
> with a graphics subsystem. Yes, Q-bus, yes, RQDX3, yes, RD54 and RX50, 
> or RD54 and TK50. All in a BA23.

MicroVAX I, VAXstation I, the VAXstation 100 (which allowed one a 
VAX-11/750 Unibus, or two on a VAX-11/780) and a small blizzard of 
rarely-remembered three-digit VAXstation model variants for different 
graphics widgets, too, that were available before DEC got a workstation 
product available with the QVSS on the Q-bus.

Why only one 100 on a /750, you ask?  Drag a window around on the 
VAXstation 100, and the whole /750 went out to lunch.

In addition to the Q-bus and Unibus, VAXstation boxes were also 
available with the BI bus, with the M-bus on the SMP VAXstation 
systems, and various busless boxes.

> They might have come with RD53 as well, but you get they idea...

The earliest MicroVAX I boxes arrived in a BA23 box, with an RX50 and 
an RD51 hanging off an RQDX1.  You could watch that RD51 disk seek, 
too, with the rotation of the knob that stuck out the side of that disk 
showing where the heads were.


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