On 2015-05-30 19:40, tony duell wrote:
LEDs themselves weren't all that much more costly than the typical pilot
lamp. I recall sending $1 cash to Montsanto and receiving 2 red (was
there any other color?) LEDs in return in 1969.
Is there a good reason why filament lamps were used on minicomputer
front panels until the mid 1970s? Things like the PDP11/45, Philips P850, etc
all used filament bulbs, not LEDs.
By the 11/70, as well as the PDP-8/M and PDP-8/F DEC had switched to
LEDs. So they switched before 1975.
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: b...@softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
