On 01/06/2015 17:07, tony duell wrote:
DEC used little modules containing an LED and series resistor that were
the same size as the bi-pin T1+3/4 bulbs used earlier. In a CPU panel you
had to clip out the pre-heat resistors, for obvious reasons. My 8/e is like
that,
although I think some 8/e's h
On 2015-06-01 19:42, tony duell wrote:
Thinking about it, I find it surprising that on later disk drives -- RL's,
RK07s,
R80s etc, they used bulbs and not LEDs. By that date LEDs were easily available
and
reliable.
I think it was just harder to replace the construction where you had
push butt
> > Thinking about it, I find it surprising that on later disk drives -- RL's,
> > RK07s,
> > R80s etc, they used bulbs and not LEDs. By that date LEDs were easily
> > available and
> > reliable.
>
> I think it was just harder to replace the construction where you had
> push buttons with lamps.
On 2015-06-01 18:07, tony duell wrote:
Thinking about it, I seem to remember seeing some picture of an 11/70
with bulbs as well, but all 11/70 machines I've seen or worked on had
LEDs, so I suspect they might have had bulbs initially as well.
DEC used little modules containing an LED and seri
>
>
> Thinking about it, I seem to remember seeing some picture of an 11/70
> with bulbs as well, but all 11/70 machines I've seen or worked on had
> LEDs, so I suspect they might have had bulbs initially as well.
DEC used little modules containing an LED and series resistor that were
the same
On 2015-06-01 17:31, Jon Elson wrote:
On 06/01/2015 04:03 AM, Christian Corti wrote:
On Sat, 30 May 2015, Jon Elson wrote:
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,
On 06/01/2015 04:03 AM, Christian Corti wrote:
On Sat, 30 May 2015, Jon Elson wrote:
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.
Inertia! The 11/45 was de
On Sat, 30 May 2015, Jon Elson wrote:
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.
Inertia! The 11/45 was designed before LEDs were available, and so they
n
On 05/30/2015 05:00 PM, Brent Hilpert wrote:
If you look closely at the displays, esp. at an angle to the glass, you
can see the anode coating on the inside surface of the glass. If you see
a red/brownish non-uniform discoloration in that coating, or
discoloration around the ends of the segment b
> And the annoying and inconsistent use of incandescent bulbs for the power
> indicator and optical tape detector in
> the 9830 . . when the main display is LED.
Indeed. I had to replace the former (but not the latter) in my 9830. I am told
the LDR in the tape sensor can
give trouble too, and
On 2015-May-30, at 3:13 PM, ben wrote:
> On 5/30/2015 4:00 PM, Brent Hilpert wrote:
>
>> If I ever get around to building a NIXIE clock, I was going to try
>> putting a motion detector in it to turn the display on/off for the
>> sake of longevity of the displays.
>
> An alarm would be nice too. B
On 5/30/2015 4:00 PM, Brent Hilpert wrote:
If I ever get around to building a NIXIE clock, I was going to try
putting a motion detector in it to turn the display on/off for the
sake of longevity of the displays.
An alarm would be nice too. Ben.
PS: On the web some where, they have all transist
On 2015-May-30, at 9:19 AM, Jules Richardson wrote:
> On 05/29/2015 08:53 PM, Brent Hilpert wrote:
>>> I'm almost certain that they're from old gas pumps - maybe the
>>> displays are just more readable in bright sunlight than LED? (there's
>>> a sticker on one of the PSU boards with a 'shipping dat
On 2015-May-30, at 8:19 AM, tony duell wrote:
>
>> JOOI, does anyone know when Panaplex 7-segment displays started going the
>> way of the dodo, to be replaced with LED displays (and, on the back of
>> that, what were the advantages of a Panaplex-type display over an LED one?)
>
> It would appear
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 minicompu
On 2015-May-30, at 8:14 AM, tony duell wrote:
>> calcs that used the smaller versoions. In calcs, they were largely
>> superseded by vacuum-flourescent displays
>> which were easier to drive, had a longer life, and could also be made with
>> bright, large digits.
>
> I am surprised about the li
On 05/30/2015 12:40 PM, 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 minicom
On 05/30/2015 10:40 AM, tony duell wrote:
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.
I can think of a few reasons.
First, a filament bulb has the effect of
>
> 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 197
On 05/30/2015 08:19 AM, tony duell wrote:
It would appear that in the early 1970s LEDs were very expensive. I have been
looking at the
HP5930x HPIB units and in many cases the status indicators (power on,
listening, etc) are
filament bulbs + driver transistors. I can think of no advantage to u
On 05/29/2015 08:53 PM, Brent Hilpert wrote:
I'm almost certain that they're from old gas pumps - maybe the
displays are just more readable in bright sunlight than LED? (there's
a sticker on one of the PSU boards with a 'shipping date' in 1999)
Funny, I was about to mention that use. I remember
On 05/30/2015 10:19 AM, tony duell wrote:
JOOI, does anyone know when Panaplex 7-segment displays started going the
way of the dodo, to be replaced with LED displays (and, on the back of
that, what were the advantages of a Panaplex-type display over an LED one?)
It would appear that in the ea
> JOOI, does anyone know when Panaplex 7-segment displays started going the
> way of the dodo, to be replaced with LED displays (and, on the back of
> that, what were the advantages of a Panaplex-type display over an LED one?)
It would appear that in the early 1970s LEDs were very expensive. I ha
> Panaplex and other 7-seg gas discharge displays were used in calculators up
> to the mid-70s. Actually one of the
> last uses in a calculator might be the HP-9815 (1975/6):
> http://www.cs.ubc.ca/~hilpert/eec/calcs/HP9815A.html
> They were mostly used in desktops for the sake of
I'll assume that you've seen the "roll your own" panaplex displays.
Does that count as manufacture?
http://www.imajeenyus.com/vacuum/20101115_second_panaplex/index.shtml
--Chuck
On 2015-May-29, at 3:54 PM, Jules Richardson wrote:
> JOOI, does anyone know when Panaplex 7-segment displays started going the way
> of the dodo, to be replaced with LED displays (and, on the back of that, what
> were the advantages of a Panaplex-type display over an LED one?)
Panaplex and othe
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