Re: Microcap12 Spice simulator

2019-10-21 Thread Paul Koning via cctalk
> 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 >

VT420 drawings

2019-10-21 Thread Mattis Lind via cctalk
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.

Re: Anyone familiar with these vintage touchscreens?

2019-10-21 Thread Tony Duell via cctalk
> 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

Re: Anyone familiar with these vintage touchscreens?

2019-10-21 Thread Cory Heisterkamp via cctalk
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. >

Re: Anyone familiar with these vintage touchscreens?

2019-10-21 Thread Paul Koning via cctalk
> 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

Re: plated wire memory

2019-10-21 Thread dwight via cctalk
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

Re: Anyone familiar with these vintage touchscreens?

2019-10-21 Thread John Foust via cctalk
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

Re: Anyone familiar with these vintage touchscreens?

2019-10-21 Thread Paul Koning via cctalk
> 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 >

Re: VT420 drawings

2019-10-21 Thread Zane Healy via cctalk
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

Re: plated wire memory

2019-10-21 Thread William Donzelli via cctalk
> 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

Re: Anyone familiar with these vintage touchscreens?

2019-10-21 Thread John Foust via cctalk
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.

Microcap12 Spice simulator

2019-10-21 Thread Paul Birkel via cctalk
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

Re: plated wire memory

2019-10-21 Thread Todd Pisek via cctalk
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

Re: Anyone familiar with these vintage touchscreens?

2019-10-21 Thread Patrick Finnegan via cctalk
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 > >

Commercial touchscreens (was Re: Anyone familiar with these vintage touchscreens?)

2019-10-21 Thread Al Kossow via cctalk
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

Re: plated wire memory

2019-10-21 Thread dwight via cctalk
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.

Re: Looking for DEC RA80 (or RM80, R80) service manual (EK-ORA80-SV or similar)

2019-10-21 Thread Paul Anderson via cctalk
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.