| General > General Technical Chat |
| What's your favorite calculator? |
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| rsjsouza:
--- Quote from: rdl on October 22, 2022, 10:21:14 pm ---I have the older version of the TI Programmer. It has the little red bubble LEDs. I bought it during my quest to find a calculator with light up digits. --- End quote --- I also have this calculator and love it. The red display brings me back to my childhood and my dad's TI59 |
| rsjsouza:
--- Quote from: wn1fju on October 22, 2022, 12:27:45 pm ---AC powered, Nixie tubes, fixed-point arithmetic, memory, 52 years old and going strong. My favorite. --- End quote --- Beautiful model you have there. I have a nixie calculator as well (Casio AS-A), but unfortunately it is a very early model that is quite unreliable and mine works well for a few minutes before the results start going cuckoo. I still need to work on it, but the -24V MOS logic is quite difficult to get right with these cheapie logic analyzers. My page where I have several photos of it: https://sites.google.com/view/vbeletronico/casio-as-a-vbe-014 |
| David Hess:
I refurbished the battery pack for an NOS (new old stock) TI-55 a couple weeks ago and found something weird. When I originally fixed the battery pack, I tested it with the calculator and the calculator was broken. It had never occurred to me that an NOS TI-55 would not work. Further testing with a power supply confirmed it. So I found a couple of junked TI-55s on Ebay and planned on replacing the processor/display board. When the Ebay units arrived, I tested them on my power supply and they worked fine. Then I wondered what the current draw was so I swapped test leads and ... now neither of the two TI-55s from Ebay worked. What the hell? I checked the test leads and they were connected correctly, so that did not make any sense, but then I noticed that the other test leads were backwards. So I connected power backwards to the NOS TI-55 and it worked fine. What happened is that Texas Instruments manufactured them with the red lead as negative and the black lead as positive. |
| rsjsouza:
This is plain evil... I put this as evil as the negative center tip on power barrel jacks of japanese musical instruments. |
| eti:
The one GOD gave me, in me noggin ;) |
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