Pinouts of Connectors

HP48/HP95 calculator connector pinout

layout
schematic diagram
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4 pin HP48 calculator special connector pin-out & layout
4 pin HP48 calculator special connector  at the calculator
Pin Name Dir Description
1 - - -
2 TXD OUT Transmit Data
3 RXD IN Receive Data
4 GND - Ground

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Pinouts.ru > Pinouts of different devices connectors >  Pinout of HP48/HP95 calculator connector and layout of 4 pin HP48 calculator special connector

Source(s): Hardware Book
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