30 Jan
2002
30 Jan
'02
11:17 a.m.
On Jan 30, 15:36, Marvin Johnston wrote:
What is the voltage, current, and style of the lamps used on the PDP-8
series of computers? I recall seeing 14V, 28V lamps both mentioned, but
no current ratings.
My PDP-8/E uses 12V or 14V bulbs, running off an 8V (nominal) supply. I'm
sure I posted some of the details to the list not very long ago, when I was
thinking about replacing the non-original LEDs with original bulbs. Other
models may very well be different, though.
--
Pete Peter Turnbull
Network Manager
University of York
30 Jan
30 Jan
11:42 a.m.
--- Pete Turnbull <pete(a)dunnington.u-net.com> wrote:
My PDP-8/E uses 12V or 14V bulbs, running off an 8V
(nominal) supply.
Yes... different bulbs, different circuits.
Other models may very well be different, though.
The PDP-8/E uses TTL logic. The R-series stuff does not. The
supply rails are +10VDC and -15VDC... not the same.
The pre-TTL stuff apparently uses 28VDC bulbs with a wire base,
running off a nominal 12VDC. They obviously learned something
from their early products.
-ethan
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