HP-97 - More Tests - Still Not Working - Vintage Calculators
Автор: GrumpyTim
Загружено: 2022-12-16
Просмотров: 1119
In the last video we looked at my 1979 HP-97 and 1990 Elektronika MC1103 vintage electronic calculators, both RPN (Reverse Polish Notation) calculators, and both were not working. This time round I'll concentrate on the HP, in the hopes I can get a bit closer to finding the fault, although, as I said in the previous video, I suspect the fault is a failed chip, if so, these are unobtainable, so the calculator will remain broken.
I'll show the tests I'd already performed using an oscilloscope along with a few fresh tests.
You can see the previous video here:
• Epic Fail - HP 97 & Elektronika MC 1103 ...
...and you can see my other vintage calculators in this playlist:
• Vintage Calculators - Mechanical and Early...
Start 00:00
PCB Layout 00:18
Power on Reset 01:41
Sync, RCD, Strobe & Phi 02:43
Printer 04:03
Keyboard 04:49
IS & Data 06:04
Summary 06:48
Outro 07:02
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Outro Music
"As Yet Untitled"
by GrumpyTim (available to download from GrumpyTim's Bandcamp page)
https://grumpytim.bandcamp.com/
http://www.grumpytim.com
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