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Another red dot calculator
03-18-2014, 02:20 AM
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Another red dot calculator
I was looking through my collection of TI calculators and I discovered that the DATAMATH's show a red bar beside the switch when the switch is in the ON position! Do you suppose that is a coincidence?

Here's something else that TI and HP did in a sImilar manner back in those days -- both the TI DATAMATH's and the HP Classics used a "bath tub" typef of battery compartment which prevented cell leakage from damaging the circuitry. As result my three early model DATAMATH's which used six hard-wired rechargeable cells and three of my six HP Classics show evidence of substantial cell leakage but no circuit damage. In subsequent designs both manufacturers abandoned that common sense approach with the result that circuit damage would typically result if cell leakage occurred. Why would they have done that when their earliest models show that the knew better?

Palmer O. Hanson Jr.
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Another red dot calculator - Palmer O. Hanson Jr. - 03-18-2014 02:20 AM

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