20 Mar
2017
20 Mar
'17
6:51 p.m.
On 2017-Mar-20, at 6:58 AM, Jacek Greniger via cctalk wrote:
Hi,
Two years ago I've found scans in PDF with the article (dated 197?, I don't
remember) describing DIY TTL-based calculator. This was microprogrammed
machine (if I remember correctly microproprogram was "stored" in the diode
array). It has LED display and possiblity to calculate square root.
Definitely not talking about EDUC-8 computer from 1975. I think this
calculator was published a little bit earlier.
Unfortunately I'm no longer able to find it. Does anyone associate the name of
that magazine?
There's this one:
http://bitsavers.trailing-edge.com/pdf/practicalElectronics/digi-cal/Digi-C…
I haven't looked at it in depth, but cursorily it looks like a way-behind-the-times
(then) architecture -
it looks like it's doing multiplication by exhaustive iteration, for example.
One could reimplement a 1960s desktop calc design in TTL and be ahead.