AMD bit-slice machines
hilpert at cs.ubc.ca
Sat Dec 31 21:41:26 CST 2005
On the topic of bit-slices, and an earlier thread which mentioned
'pre-announced chips that never made it into production':
The last quarter of the 1975 Fairchild CMOS databook is dedicated to a section
titled "Products Planned for 1975" and all the sheets in the section are stamped
"Preliminary". Most of the devices made it into the standard 4000-series, but the
ones I always found rather curious were a group of devices:
34703: 16*4 parallel/serial FIFO
34704: data-path switch, 4-bit wide
34705: arithmetic logic register stack, 4-bit wide
34706: 16*4 FILO program stack
34707: data access register, 4-bit wide
34710: 16*4 clocked RAM
which seem to be intended for implementing CMOS-based bit-slice processors.
I never saw or heard about the devices anywhere else.
I speculate it's one of those places where Fairchild missed the boat
(there's a rather limited market for building bit-slice processors from multiple
chips and slow CMOS in the era of the microprocessor).
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