> On Oct 21, 2019, at 4:16 AM, Paul Birkel via cctech
> wrote:
>
> Forwarding from another list because of its general interest:
>
> .
> A heads up that the guy who was responsible for the full professional grade
> Spice simulator Microcap (latest version 12) has retired, and made his
>
I got heaps of documentation from an ex-DEC field service engineer.
Among them there were a VT420 print set. I didn't see any schematics for
the VT420 on bitsavers so even though this one looks a bit strange it is
better than nothing.
> Theinfrared array you're thinking of was invented at PLATO, for flat panel
> (plasma) displays. They don't work for CRTs because of the convex screen.
My HP150 will have to disagree with you there.
-tony
On Mon, Oct 21, 2019 at 11:51 AM Tony Duell via cctalk <
cctalk@classiccmp.org> wrote:
> > Theinfrared array you're thinking of was invented at PLATO, for flat
> panel (plasma) displays. They don't work for CRTs because of the convex
> screen.
>
> My HP150 will have to disagree with you there.
>
> On Oct 21, 2019, at 12:51 PM, Tony Duell via cctalk
> wrote:
>
>> Theinfrared array you're thinking of was invented at PLATO, for flat panel
>> (plasma) displays. They don't work for CRTs because of the convex screen.
>
> My HP150 will have to disagree with you there.
>
> -tony
I
The plated wire sounds like really fussy stuff. The layer of permalloy had to
be thin but not to thin. I suspect that was to optimize the internal field
compared to the outside word select signal.
At first, I couldn't understand why they'd need to use beryllium copper but it
seems the wires
And what sort of technology was that screen using? I expected to see
the grid array of outer infrared LEDs and detectors that I vaguely remember
from that era, but I don't see that here. Someone was making a tube
that was coarsely touch-sensitive?
- John
> On Oct 21, 2019, at 12:19 PM, John Foust via cctalk
> wrote:
>
>
> And what sort of technology was that screen using? I expected to see
> the grid array of outer infrared LEDs and detectors that I vaguely remember
> from that era, but I don't see that here. Someone was making a tube
>
Thank you! I don’t need it now, but since I standardized on VT420’s years ago,
it’s nice to have.
Zane
> On Oct 21, 2019, at 6:37 AM, Mattis Lind via cctalk
> wrote:
>
> I got heaps of documentation from an ex-DEC field service engineer.
>
> Among them there were a VT420 print set. I
> The 9300 used it, Donzelli says it wasn't very reliable
And I do not remember where I heard that. It may have been from a
Univac old-timer.
--
Will
At 11:51 AM 10/21/2019, Tony Duell wrote:
>> Theinfrared array you're thinking of was invented at PLATO, for flat panel
>> (plasma) displays. They don't work for CRTs because of the convex screen.
>
>My HP150 will have to disagree with you there.
Forwarding from another list because of its general interest:
.
A heads up that the guy who was responsible for the full professional grade
Spice simulator Microcap (latest version 12) has retired, and made his
software downloadable free of charge. It was $4,500 per seat before.
Download
I worked at Univac Defense Systems in the early 70's. The launch control
computer for the Minuteman was made by Univac. It had plated wire memory. I
remember when the failure analysis group had to analyze a module that failed in
the field. The module was locked in a safe and someone had to
On Mon, Oct 21, 2019 at 12:49 PM Paul Koning via cctalk
wrote:
> > And what sort of technology was that screen using? I expected to see
> > the grid array of outer infrared LEDs and detectors that I vaguely remember
> > from that era, but I don't see that here. Someone was making a tube
> >
Boundless made CRT kits for decades
They are also on HP 16500 logic analyzers
I had a prototype IR touchscreen monitor for the Alto, but stupidly didn't hang
onto it.
On 10/21/19 10:30 AM, Patrick Finnegan via cctalk wrote:
> I've got a VT100 with a (3rd party?) IR-LED based touch screen
It can't be all that bad if it has been flying in space for all these year
without crashing the processors. The CMOS processor has lost several CMOS
memory bits but the main control processor is still chugging away on its
original wire memory.
There are a lot of factors in the entire system.
I have RA60 prints, with notes,
RA81 Maint Guide AA-M879B-TC
RA80 MG AA-M186B-TC
RM80 POCKET SERV GUIDE EK-0RM80-PG-001
RA81 Field Maint print set MP-01359?
I also have prints and or manuals for RP04/5/6
RK611, RK06/07
TUxx
and parts for mass bus devices which I will never use.
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