John Savard
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 Posted:
Mon Mar 07, 2005 3:41 am Post subject:
Computer Architecture Pages Back Up (sort of) |
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On my home page,
http://home.ecn.ab.ca/~jsavard/index.html
there is now a link to the document
http://home.ecn.ab.ca/~jsavard/arch.pdf
a document embodying an updated version of the description of a
computer architecture formerly on my web site, as I found I had just
barely enough available web space to make it available in this form.
While some steps have been taken to make it readable, it is not a
particularly good-quality document; the conversion from HTML was done
hastily. Some diagrams were resized so they wouldn't go off the page
or be squashed, the background was changed from gray to white - the
conversion was done by an old word processor - but in a lot of places
diagrams force an advance to the next page; a proper conversion would
have flowed the text around more often than done on the original web
site.
In any event, there are a few minor items added, and a few things are
explained in more detail. Actually, quite a bit is added. The Program
Status Octaword is now twice as long - and I gave up and called it a
Program Status Block. Address modes are added that cause the computer
to use the cache as its memory, except when an explicit block transfer
is requested - like the CDC 1604. Cache hints are added to the branch
hint mode. Compressed decimal, instead of being invoked by a change to
the decimal format in use, is, like the Simple Floating format,
handled by means of instructions with the 173703 instruction prefix,
and zoned decimal arithmetic is also added. |
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