Model: SR-51 A
Battery: BP 1
Adapter: AC9130
Year: 1976
Chip: TMC0501 / 522 / 523
Info: This calculator has the 4 keys for BLUE operations is it a prototype or a fake?
If you have the opportunity to support those who work for free, in this non-profit museum, and with the aim of opening a museum in the city of Rieti dedicated to Texas Instruments. DONATE !