Saturday, January 14, 2012

Architecture

That last post had been sitting in Drafts for over 2 weeks, so I felt like I just had to get it out.  Anyway, most of the parts have either been ordered or are in shopping carts.

The general architecture is pretty striaghtfoward.  It was mostly taken from the book The Elements of Computing Systems, by Noam Nisan and Shimon Schocken.  Probably its most attractive feature is that its control logic consists of 2 or 3 ICs containing in total maybe two dozen MOSFET transistors.  Most of the instructions are essentially microcoded.  For example, as long as bit 15 of the instruction is 1, bits 11-6 of the opcode go directly to the ALU.  The computer is a Harvard architecture, but that can easily be modified into a  modified Harvard architecture.

So, anyway, I will be quite possibly posting a variety of pictures at some point.

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