Texas Instruments

• 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 

• 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. 

The TI-58 and TI-59 calculators introduced a novelty, the Solid State Software Modules™ with up to 5000 program steps. On the backside of the TI-58/59 you'll note a small lid with a place for a module. 

The Master Library, known as "Module -1-", with 25 different programs was included with the TI-58, TI-58C, and TI-59. Twelve additional Solid State Software Modules™, known as "Module -2- to -13-" were available from Texas Instruments as Standard Modules.

• TI 58 / 59 series

Model: TI-59 ALLIANZ
Battery: BP1 A
Adapter: AC9131 or DC9105
Year: 1979
Chip:  TMC0501E TMC0591 CD2400 CD2401 TMC0573 TC5047         
Info: made in Holland

• TI 58 / 59 series

Model: TI-59 Chrysler Credicavia
Battery: BP1 A
Adapter: AC9131 or DC9105
Year: 1978
Chip:  TMC0501E TMC0591 CD2400 CD2401 TMC0573 TC5047         
Info: made in Holland

• TI 58 / 59 series

Model: TI-59 Creg insurance FR
Battery: BP1 A
Adapter: AC9131 or DC9105
Year: 1978
Chip:  TMC0501E TMC0591 CD2400 CD2401 TMC0573 TC5047         
Info: The innovative TI-59 was the perfect base for a lot of customized calculators. This one was used end of the 70^th by insurance agents of the French CREG company.