DSD-440 software

[Vintage Computer Festival]

On Mon, 20 Jun 2005, Doc Shipley wrote:

> > The RXV21 clone controller I have in my primary 11/23+ system (an MXV21
> > made by MDA) allows simple formatting by poking a couple values into the
> > right registers.  It works great.  A few minutes of coding would result in
> > a SAV program that does it for you with prompts.
>
>    Uhh, I have a couple of Qbus cards by MDA that I've never identified.
>   Got pics?

No, but just plug their model numbers into the handy dandy Qbus and Unibus
Module Field Guide and you'll find out what they are:

http://world.std.com/~mbg/pdp11-field-guide.txt

> >>   Another thing that caught me short is that the DSD-440 honors the
> >>write-protect notch.  The RX02 doesn't (or my RX02s have been modified),
> >>so it was a little surprising when I got a write-protect error on a
> >>scratch disk I've been using on my 11/84.
> >
> >
> > Your RX02s are broken!
>
>    I suspected thay'd been "fixed", but I don't think it's a
> malfunction.  All three sets came from the same company and all three
> write to disks with the notch open.

Weird.

-- 

Sellam Ismail                                        Vintage Computer Festival
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International Man of Intrigue and Danger                http://www.vintage.org

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