PDP-11 addressing question and a model round-up

From: Vintage Computer Festival <vcf_at_siconic.com>
Date: Mon Feb 14 12:54:53 2005

On Mon, 14 Feb 2005, Paul Koning wrote:

> With MMU enabled, each 4 kW chunk of program address space is mapped
> to a physical address of your choice (possibly two separate ones, in
> MMUs that support separate instruction and data space maps). In that
> case, I/O space might not be accessible. For user mode programs, it
> normally would not be. The kernel would have to have it mapped, of
> course. In principle you could map I/O space to any of the 8 virtual
> address blocks; in practice, I think it was always mapped to the top
> block, matching the default mapping.

What a sweet architecture!

Sellam Ismail                                        Vintage Computer Festival
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Received on Mon Feb 14 2005 - 12:54:53 GMT

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