Computer Architecture Pages Back Up sort of

On my home page,

there is now a link to the document

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.