5 Nov
2011
5 Nov
'11
12:16 a.m.
Chuck Guzis wrote:
Did anyone actually use a 4581 ALU in anything?
I've always
wondered if anyone built up a CPU from 4000 CMOS...
I wrote:
RCA had a bit-slice part in one of their 1970s COSMOS
databooks,
with an app note in the back, but I've never been able to find that
particular COSMOS databook again, so if it went into production
at all it must not have lasted very long. My recollection is that it
was not as fancy as the Am2901.
Brent Hilpert wrote:
The CD40181 (and 40182) is mentioned in some RCA
COS/MOS
databooks from the 70s. Exactly what the name suggests: a
CMOS version of the 74181 4-bit ALU.
Same with the 4581/4582. Possibly different part numbers assigned by
different vendors for effectively the same part.
I was referring to a more integrated bit-slice part, though since I
can't find any docs on it now, I have no idea what the part number was
nor the exact functions included.
Fairchild made some funky bit-slice ALU, register
stack, etc.,
devices in the 70s (I think we have spoken of them here before).
The Fairchild Macrologic parts (9401-9410 bipolar, 4701-4710 CMOS) are
reasonably well known, but I'm still looking for datasheets for their
much earlier 3800 and 3804 MOS ALU chips.