17 Mar
2018
17 Mar
'18
5:05 a.m.
back in the day (70s) ?when selling these ?things ?2ed ?hand ? E ?was ind. ? M and F were
always ?LED... I ?preferred?the ?leds ?Ed#
?
?
In a message dated 3/16/2018 7:31:26 PM US Mountain Standard Time, cctalk at
classiccmp.org writes:
?
On Fri, Mar 16, 2018, 20:58 allison via cctalk <cctalk at classiccmp.org wrote:
I think he's aware (hence "style").
Kyle
On 03/16/2018 08:28 PM, Charles Dickman via cctalk
wrote:
I have seen several 8/f systems that have LEDs, for what it's worth. I can
only imagine DEC was transitioning the 8/m and 8/f to take LEDs instead of
incandescents.
So the PDP8/e used the KC8-EA programmers console
which has
incandescent indicator lamps and the PDP8/f used the KC8-FL
programmers console which has LED indicator lamps.
Wrong. The 8f uses the same as
the 8e. It was the 8m that had the
LED console. If memory serves it was date of design that influenced it.
I can be certain as I have an 8f built in 1973. I've since moded it to
take bright yellow LEDs as lamps are not easy to find and annoying
to replace. If I care to I can put the lamps back. Since I put
operational
over absolute faithful its better as is, less digging in the box.
The bulbs are still available on Mouser. I've ordered a bunch for my 8/e
and have been very happy with them.
http://so-much-stuff.com/pdp8/repair/bulbs.php
However its possible to swap the panels, I tried it once and it pass diags
and worked fine. Didn't like the red.
I've found that my LED 8/m is very hard to read, as the LEDs are very dim.
Another console question...
Has anyone ever seen a PDP8/i style console for the PDP8/e? Looking at
the way the PDP8/e console functions, it should be possible to time
multiplex all the register to the data bus so they are all visible at
once when the machine is halted.
No and can't! The 8i (nor the 8L) was not
omnibus.