terça-feira, 11 de novembro de 2014

TEXAS TI-59

For many, the best calculator in the 70's. Powerful and low cost made it so popular.


Card Reader.




















Power adapter / Charger
Model AC 9900/H  6.2VAC / 200mA / 3VA







Replacement Battery - wrong type, soldered to the calculator, and dead


 


After cleaning







Documentation
































Read Heads signal:




Keyboard replacment:






Initial testing:
Three jumpers are needed in order to a successful power On.
On the 8-pin female connector, from left to right in the picture:
- Connect together the 2nd, 3rd and 4th pins (power on switch);
- Connect the 5th and the 8th pins (card reader sensor);
- Connect the 6th and the 7th pins (card reader sensor).




Repairing the battery connector::




Assembling:






Final testing:








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