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TI 50Model: TI-50
Battery: 2 x LR44
Adapter: 
Year: 1979
Chip:  TPO321
Info:  first LCD and slimline LCD   

 

 

 


 

TI 51 IIIModel: TI-51 III
Battery: BP7
Adapter: AC9132
Year: 1979 Price: L.59.000 + iva 14%
Chip: TMC1502
Info: TI-51 III same as TI-55, but TI-55 was sold in the US while TI-51 III was sold in Europe. From an advertisement of the time! The most technical. Because it specializes in solving math problems (90 functions): from logarithms to trigonometry and complex statistical problems. Easy programmability (32 program steps, 10 memory registers) exponential notation. SOA (algebraic operating system). Polar/Rectangular conversions and unit conversions. It offers you the possibility to solve all your professional problems at the touch of a button. 

 

 

 


 

TI 53Model: TI-53
Battery: 2 x LR44
Adapter: 
Year: 1982
Chip:  TPO323
Info:  first LCD and slimline LCD

 

 

 


 

TI 0053 slanted RCIModel: TI-53 slanted
Battery: 2 x LR44
Adapter: 
Year: 1985 ( RCI 17 85 )
Chip:  TPO323
Info: Calculator donated by Ludovisi Giancarlo in 2023 during the 2nd edition "the story with Texas Instruments" in Rieti, (World Chili Pepper Fair).

 

 

 


 

TI 54Model: TI-54
Battery: 2 x LR44
Adapter: 
Year: 1982
Chip:  CD4555,CD4551  
Info:  slanted LCD  generation