FPUs for small computers (Was: What to download for a PDP-8)
shoppa_classiccmp at trailing-edge.com
Wed Oct 17 12:48:23 CDT 2007
"Chuck Guzis" <cclist at sydex.com> wrote:
> On 17 Oct 2007 at 12:09, Jim Battle wrote:
> > Finally, I recall seeing an article where somebody took a pocket
> > calculator chip and essentially poked simulated keystrokes at it and
> > then decoded the LED driver output to determine the answer. It was very
> > slow, though, so all it saved was the space of the floating point
> > library code.
> I remember that one. It may have been an early issue of Byte. I
> also wondered at the time if any speed was gained over just running
> plain old x80 code.
This had a couple of S-100 incarnations, one by an outfit known
as Mini-Micro-Mart. In the 1975 timeframe when you had a few K
of memory in a S-100 system it made at least a little sense.
Later extrapolations used a AMD 9511/9512 chip, as in the
Compupro System Support, and boards by TDL and Northstar. That
was a very expensive chip whenever I saw it for sale :-).
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