Have you switched it off and on again?

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TheGreenGoblin
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Re: Have you switched it off and on again?

#21 Post by TheGreenGoblin » Sun Apr 05, 2020 12:24 pm

Boac wrote:
Sun Apr 05, 2020 11:49 am
Heavens forfend, Sir, that you should think I cast aspersions on the lady's qualifications! It will be Mice at dawn on the common by the Oak tree for you! I was referring to the rather 'dubious' cover for the interest in the item as in "Do know someone who has just started a business manufacturing donkey whip".
Forgive me Sir, I send your second, in the proposed duel, back to you with a full written retraction by me and my public apologies for my misunderstanding and for the unintended slight to you and the said lady. It is with much pleasure that I can confirm that we will not need to attempt to hack each other to death with sabres in Les Bois du Boulogne, or worse, attempt to find satisfaction, in balloons with muskets over a fetid fen in Kent, or by some other equally frightful aerial means of mutual destruction! ;)))

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Re: Have you switched it off and on again?

#22 Post by Alisoncc » Sun Apr 05, 2020 12:30 pm

TheGreenGoblin wrote:
Sun Apr 05, 2020 11:07 am
The University of Witwatersrand had and still has a very good MBA course.
This was fifty years ago guys. Probably changed a bit.
Rev Mother Bene Gesserit.

Sent from my PDP11/05 running RSX-11D via an ASR33 (TTY)

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Re: Have you switched it off and on again?

#23 Post by TheGreenGoblin » Sun Apr 05, 2020 12:33 pm

Alisoncc wrote:
Sun Apr 05, 2020 12:30 pm
This was fifty years ago guys. Probably changed a bit.
Zulus, thousand of "em" Ma'am.... :-bd
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Re: Have you switched it off and on again?

#24 Post by Alisoncc » Sun Apr 05, 2020 12:39 pm

ian16th wrote:
Sun Apr 05, 2020 11:48 am
A proper Process Controller wouldn't let you overwrite memory, be it occupied by Operating System or Application Code.
Using DEC PDP11/44's running RSX11/M to drive a string of Allen Bradley PLC's.

With reference to allocating global memory leading to Memory leakage. This was doing bit manipulation when every bit stored had a value.
Rev Mother Bene Gesserit.

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Re: Have you switched it off and on again?

#25 Post by ian16th » Sun Apr 05, 2020 12:54 pm

I can't remember PLC's being around in 1967!
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Re: Have you switched it off and on again?

#26 Post by TheGreenGoblin » Sun Apr 05, 2020 1:01 pm

ian16th wrote:
Sun Apr 05, 2020 12:54 pm
I can't remember PLC's being around in 1967!
I can't opine on that one, I was still in my schoolboy shorts, blazer and cap at the time. ;)))
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Re: Have you switched it off and on again?

#27 Post by Alisoncc » Sun Apr 05, 2020 1:14 pm

ian16th wrote:
Sun Apr 05, 2020 12:54 pm
I can't remember PLC's being around in 1967!
Where did 1967 come from, ian.

PLC development began in 1968 in response to a request from an US car manufacturer (GE). The first PLCs were installed in industry in 1969.

Communications abilities began to appear in approximately 1973. They could also be used in the 70’s to send and receive varying voltages to allow them to enter the analog world.

The 80’s saw an attempt to:
standardize communications with manufacturing automation protocol (MAP), reduce the size of the PLC, and making them software programmable through symbolic programming on personal computers instead of dedicated programming terminals or handheld programmers.
http://www.plcmanual.com/plc-history
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Re: Have you switched it off and on again?

#28 Post by ian16th » Sun Apr 05, 2020 1:35 pm

1967 was when I installed my 1st 1800, at Henry Wiggin, Hereford.

Its real time task was controlling 400 Creep Furnaces, each with 3 thermocouples, connected to 1200 analogue i/p points. The control was via digital o/p matrix driving Sangmo Western interface to the furnaces.

In its spare time it interfaced with a Philips X-Ray spectrometer, and printed out its reports.

This was done with 32K of 16-bit words of core memory, 3 disk drives, each of 512,000 16-bit words.
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Re: Have you switched it off and on again?

#29 Post by Boac » Sun Apr 05, 2020 3:03 pm

TGG wrote:Forgive me Sir, I send your second, in the proposed duel, back to you with a full written retraction by me and my public apologies for my misunderstanding and for the unintended slight to you and the said lady.
- graciously accepted, Sir, but do note I had only challenged you to a duel of Mouses. Remember, the Mouse is mightier than the sword.

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Re: Have you switched it off and on again?

#30 Post by TheGreenGoblin » Sun Apr 05, 2020 3:10 pm

Boac wrote:
Sun Apr 05, 2020 3:03 pm
TGG wrote: Remember, the Mouse is mightier than the sword.

True and thereby lies a cable or cord, unless of course you use one of those confounded Blue Tooth connections... :)
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Re: Have you switched it off and on again?

#31 Post by ian16th » Sun Apr 05, 2020 3:21 pm

BlueTooth is a genuine Black Art!

My BlueTooth enabled hearing aids occasionally receive a single 'Burr' of a ring indicate, and I haven't a clue where it comes from.

This happens when I am not aware of them being paired with any device.
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Re: Have you switched it off and on again?

#32 Post by Boac » Sun Apr 05, 2020 3:25 pm

TGG - I thought for one awful moment I was going to get "Therein hangs a tail", but I was spared.

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Re: Have you switched it off and on again?

#33 Post by TheGreenGoblin » Wed Apr 08, 2020 9:06 am

Calling all old COBOL programmers - The State of New Jersey needs YOU!

https://www.cnbc.com/2020/04/06/new-jer ... -248611201

An old "friend" sent this to me and suggested I apply... =))
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Re: Have you switched it off and on again?

#34 Post by John Hill » Wed Apr 08, 2020 9:18 am

I just wish I could find a serviceable VT52 or similar, I need it for a project I am working on.
Been in data comm since we formed the bits individually with a Morse key.

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Re: Have you switched it off and on again?

#35 Post by TheGreenGoblin » Wed Apr 08, 2020 9:28 am

John Hill wrote:
Wed Apr 08, 2020 9:18 am
I just wish I could find a serviceable VT52 or similar, I need it for a project I am working on.
Have tried on e-bay John? There is a plethora of old DEC kit to be found there.
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Your destination remains
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Re: Have you switched it off and on again?

#36 Post by John Hill » Wed Apr 08, 2020 9:53 am

I have been looking on line for stuff but what with freight and the uncertainty it will actually work I am tending towards rolling my own with a Raspberry Pi.
Been in data comm since we formed the bits individually with a Morse key.

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Re: Have you switched it off and on again?

#37 Post by TheGreenGoblin » Wed Apr 08, 2020 9:56 am

John Hill wrote:
Wed Apr 08, 2020 9:53 am
I have been looking on line for stuff but what with freight and the uncertainty it will actually work I am tending towards rolling my own with a Raspberry Pi.
Good, fun, call, or you could go down the emulation route...

https://github.com/kgober/VT52
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Re: Have you switched it off and on again?

#38 Post by llondel » Wed Apr 08, 2020 6:31 pm

I would put together a small emulator either with a Pi or a small PC (EBox-3300), although the Pi will be way cheaper. You can get USB-Serial cables with the RS232 level shifters built in.

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Re: Have you switched it off and on again?

#39 Post by John Hill » Wed Apr 08, 2020 8:18 pm

The project is to decode hand keyed morse and display it on a screen.

This is easy with a PC but there are problems stopping and starting the PC by power off/on. An old PC (e.g. XT) might be OK but they seem as scarce as async terminals.

Decoding with an Arduino is easy but they cant drive a display while timer interrupts are firing off as required for the decoder.

So I am looking at a Pi although I am unsure of their timing capabilites.

I need to take about 100 samples per second for decoding the hand sent morse.

We have PCs in flight simulators and they are a real pain when opening and closing the museum so I have made 'black boxes' to handle things but they require both mains and hangar light circuit supplies. Lighting circuit only available in the aeradio shack.

UPS have been voted out!

PS. When I say something cant be done that really means I dont know how.
Been in data comm since we formed the bits individually with a Morse key.

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Re: Have you switched it off and on again?

#40 Post by llondel » Thu Apr 09, 2020 4:44 am

You cheat, use the Arduino to decode it and send the decoded characters to the Pi on the USB serial port for it to display.

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