PDP-11 addressing question and a model round-up

From: Vintage Computer Festival <vcf_at_siconic.com>
Date: Mon Feb 14 02:54:09 2005

I didn't want to spend time researching this since it's not that important
and I figure I can get a quick answer here.

With the MXV21 controller I have, I needed to poke words into its
registers to format a disk. The manual instructed to poke the words in
the 177xxx range. But when I tried this nothing happened. I scratched my
head and then remembered from a previous helpful message someone talked
about how the addresses also map to higher memory sometimes. So I
tried poking the words in the equivalent 377xxx range and it worked.
What's going on here?

I'm not sure how widely known this site is, but here's a really nice
website on the PDP-11:

Yet Another PDP-11 Page

The "Production Models" link leads to a nice round-up of all (most?) of
the various PDP-11 models, which includes basic information and links to
photos and more detailed information on certain models. Now I have a
target list of models to acquire...8 down, 14 to go ;)

Also includes a nice page of tips for the RK05:


And bootstrap loaders for a bunch of storage devices:


Sellam Ismail                                        Vintage Computer Festival
International Man of Intrigue and Danger                http://www.vintage.org
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Received on Mon Feb 14 2005 - 02:54:09 GMT

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