Texas Instruments

• slanted LCD

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

• slanted LCD

Model: TI-57 lcd
Battery: 2 x LR44
Adapter: 
Year: 1984
Chip:  CD4555,CD4572
Info:  slanted LCD  generation

• majestic line

Model: TI-55
Battery: BP 7
Adapter: AC9132
Year: 1979
Chip: TMC1503          
Info: MAJESTIC line 

• majestic line

Model: TI-57 programmable
Battery: BP6 , BP7
Adapter: AC9131 , AC9132
Year: 1980
Chip: TMC1501          
Info: MAJESTIC line 

• slanted LCD

Model: TI-55 II
Battery: 2 x LR44
Adapter: 
Year: 1981
Chip:  CD4555,CD4556
Info:  slanted LCD  generation

• TI 58 / 59 series

Model: TI-58
Battery: BP1 A
Adapter: AC9131 or DC9105
Year: 1977
Chip: TMC0501E TMC0582 TMC0583 TMC0571 2x TMC0598
Info: TI-58 / 59 programmable        

• slanted LCD

Model: TI-55 III
Battery: 2 x LR44
Adapter: 
Year: 1986
Chip:  CD4555,CD4556
Info:  slanted LCD  generation

• TI 58 / 59 series

Model: TI-58 C
Battery: BP1 A
Adapter: AC9131 or DC9105
Year: 1982
Chip: TMC0501E TMC0591 CD2400 CD2401 TMC0573 TC5047     
Info: TI-58 / 59 programmable        

• slanted LCD

Model: TI-56
Battery: 2 x LR44
Adapter: 
Year: 1985
Chip:  CD4555,CD4556
Info:  slanted LCD  generation

• TI 58 / 59 series

Model: TI-59
Battery: BP1 A
Adapter: AC9131 or DC9105
Year: 1980
Chip: TMC0501E TMC0582 TMC0583 TMC0571 TMC0594  4x TMC0598    
Info: TI-58 / 59 programmable        

TI-58 or TI-59 calculator this rare Marine Navigation version uses a specialized module with navigation related programs. The calculator was mounted in a expensive wooden box and equipped with a DC-converter for usage on a boat.