4 Jan
2007
4 Jan
'07
1:29 a.m.
Allison wrote:
There are now two, perhaps three, sources from the period that indicate it was
a single gate/IC type: a dual 3-input NOR in 10-pin flat-pak. Read the
document Chuck ref'ed above (although there do seem to be some
mis-rememberings in there such as LCD instead of EL displays). I'm well aware
of the state of RTL/IC development at the time, but high-reliabiliy design
doesn't necessarily correlate with whats current in the rest of the industry.
Keep in mind the design started years before 1967/8. The IC spec sheets are
dated 1965.
Brent Hilpert <hilpert at cs.ubc.ca>
Apparently it was electro-luminescent, see other messages (too early for LED
displays, too).
Chuck Guzis wrote:
> I stumbled on this document:
> http://klabs.org/mapld04/papers/g/g233_alonso_p.doc
And whats up with this mention of LCD displays? I
didn't think there was
anything practical available that early, or that was going to stand up to the
rigours of space-flight - I have a calc with one of the first commercial LCDs
(1972) and it's still kind of rudimentary - slow, poor contrast, temperature
sensitive...
My memory of LCDs is they were way too late for the AGC and the basic
AGC design used either LEDs or Lamps in a 7 segment format. (And it
confirmed that the AGC was constructed from a single gate/IC type.)
That statement I believe is in error. While the logic used was RTL and a
single family type the logic elements for that family by the mid 60s were
more diverse than just a two input NOR. My junkbox contains parts from