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Author Topic: QST chip found  (Read 471 times)

WA2ISE

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QST chip found
« on: August 20, 2022, 05:42:59 PM »



This inside a keyboard that goes with a DEC VT220 RS232 terminal.  The sort of terminal we would use on packet back in the late 80's.

It's the 8 pin chip lower right.
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F4GFT

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Re: QST chip found
« Reply #1 on: August 21, 2022, 01:16:19 AM »

That's a UA9636 dual line driver, manufactured in week 28 of 1986. Quite appropriate for a RS232 terminal.
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N8AUC

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Re: QST chip found
« Reply #2 on: August 21, 2022, 05:14:27 AM »

Wow. Thanks for the flash back. (Late 1970s here I come!)

Once the university I attended got off punch cards and a Univac 11/08, everything went DEC.
Spent lots of time doing work on a DEC VT-100 connected to a DEC System 20.

In the engineering labs, everything was either PDP-8 (if you didn't have much budget) to
PDP-11 (if you did have budget). The VAX hadn't quite been introduced yet. The engineering lab
where my work study job was had it's own PDP-11/44.

73 de N8AUC
Eric


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K6BRN

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Re: QST chip found
« Reply #3 on: August 21, 2022, 05:47:04 AM »

The first computer I used was in high school an a PDP-8E with hand-threaded toroidal magnetic core memory - non-volatile - driving eight ASR-33 TeleTypes with tape reader/punches.  I think total memory on this really basic system was 4K 12-bit words.  For a virgin start, the bootstap loader had to be "toggled in" from the front panel, then the operating system and BASIC interpreter loaded via paper tape.  It took a while and was pretty noisey.

At University, I used a PDP-11 quite a bit and loved the very flexible, high level structure of its machine code (source, destination, operation) that made programming in it almost an assembly language level task.

I still have an old 8-bit Altair 8800, Altair 680 and complete working IMSAI 8080/disk/videoterminal system in storage.

Brian - K6BRN
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K6BRN

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Re: QST chip found
« Reply #4 on: August 21, 2022, 05:56:15 AM »

... and an RCA/COSMAC VIP-711 SBC, Macintosh 512K and a couple other very old Macs.  Crimeny.  I REALLY have to clean out the attic!

Brian - K6BRN
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WC4R

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Re: QST chip found
« Reply #5 on: August 21, 2022, 07:18:57 AM »

The first computer I used was in high school an a PDP-8E with hand-threaded toroidal magnetic core memory - non-volatile - driving eight ASR-33 TeleTypes with tape reader/punches.  I think total memory on this really basic system was 4K 12-bit words.  For a virgin start, the bootstap loader had to be "toggled in" from the front panel, then the operating system and BASIC interpreter loaded via paper tape.  It took a while and was pretty noisey.
At University, I used a PDP-11 quite a bit and loved the very flexible, high level structure of its machine code (source, des
I still have an old 8-bit Altair 8800, Altair 680 and complete working IMSAI 8080/disk/videoterminal system in storage.
Brian - K6BRN
HA! Me too. the PDP-8I in 11th grade in my case. We wrote a 'moon lander' program in machine language using those panel switches. PITA but cool.
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