semi-homemade micro

Brad Parker brad at heeltoe.com
Mon Nov 14 16:31:18 CST 2005


Jim Battle wrote:
>
>The original PDP-8 took 10 clocks at 1 MHz to execute one instruction

really?

I'm probably off, but at a cocktail party I would would have said that
some instructions took 8 clocks (f0,f1,f2,f3,e0,e1,e2,e3) and some took
12 (f0-f3, d0-d3, e0-d3).

That's according to a recent look at the "blue book", but I may have
misunderstood.  I did write up some verilog which uses those states and
it seems to be (mostly) correct, but it's done all debugged yet.

-brad


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