Brand
Used Texas Instruments calculators
Texas Instruments built its programmables on algebraic entry, which TI called AOS, instead of RPN. The TI-58 and TI-59 of 1977 were the first handheld calculators to take removable ROM modules, the Solid State Software modules, and the TI-59 added a magnetic card reader. Its rival when new was HP's HP-67, and the datamath calculator museum calls it the end of the line that began with the SR-50 in 1974. The TI-58C of 1979 fixed the TI-58's big flaw by keeping its memory with the power off. In 1982 the TI-30 SLR became TI's first solar scientific, and the TI-30 SLR+ followed in 1987. Today TI makes the only calculators the Society of Actuaries allows, and the BA II Plus is one of the two models the CFA Institute permits. The vintage TIs here all run on the BP1A rechargeable pack, so plan on a dead or leaking one.
3 calculators we cover.
Texas Instruments
Algebraic programmableTI-59
- Launched
- 1977
- Entry and display
- Algebraic · LED
- Features
- Programmable · Mag cards · Plug-ins
$80–$160 typical ask
10 on eBay
Texas Instruments
Algebraic programmableTI-58C
- Launched
- 1979
- Entry and display
- Algebraic · LED
- Features
- Programmable · Keeps memory · Plug-ins
$40–$85 typical ask
9 on eBay
Texas Instruments
Algebraic scientificTI-30 SLR+
- Launched
- 1987
- Entry and display
- Algebraic · LCD
$10–$25 typical ask
31 on eBay