AMD bit-slice machines
bfranchuk at jetnet.ab.ca
Sat Dec 31 14:41:04 CST 2005
> What about very simple 16 bit risc ?
> 4 bit opcode, 4 bit destination , 4 bit source 1, 4 bit source 2 ?
That is a simple design. Still any bitslice design is a muilti-board design
so for me, a more powerful CPU is larger word length than 16 bits.
20 bits does have two advantages in hindsight. 1) Good small computer
adddress range. 2) reasonable integer size -512k...512k
For me that is next year, this year I am working on 16bit cpu
using CPLDs... 3 for the cpu and two for bus interfacing.This is my version
of a simple CPU ... 16 bit words, 64kw memory AC, IX,SP,PC as registers
and No Indirect addressing. About PDP-8/e speed. 1.6 us operate 2.4 us
or jump on condition and 3.2 us for jump to subroutine, with 6800 style
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