26 Feb
2004
26 Feb
'04
6:02 p.m.
Remember that the 11/20 came out in 1971. I'm not
sure LEDs even
existed that long ago, and they certainly weren't common as lamp
My HP9810 calculator has LED displays and a row of 5mm LEDs along the top
of the keyboard for status indication (program/run mode, etc). Dunno the
exact date, but it's around 1972 I think.
My HP9830 even has 5*7 dot matrix LED displays in it.
But LEDs were certainly not cheap back then!
Digging... the schematics in the pdp11 directory at
www.bitsavers.org
support this: the 11/45 console schematics show lamps, the 11/70
My 11/45 certainly has lamps.
-tony