TI 0068 prototypeTI 0068 protoype 1Model: TI-68 prototype
Battery:  CR2032

Adapter: 
Year: 1985
Chip: CPU: Toshiba T9948A   
Info: Calculator donated by Massa Gennaro in 2023 during the 2nd edition "the story with Texas Instruments" in Rieti, (World Chili Pepper Fair). This was a prototype with transparent case, built in the Rieti factory.