TI-2500B
"Datamath" First TI LED model,
c.1972. SR-11 Scientific notation & square root function; c.1974
Calculator Collection
TI Department
I am not a fan of Texas Instruments calculators.
They seem like cheap toys
compared to HP's contemporary offerings - but they are an important
part of calculator history. These are some examples I have picked up over
time.
If you would like to add them to your collection, any trade offer involving
HP
components will likely be accepted...
TI-2500B
"Datamath" First TI LED model,
c.1972.
SR-11 Scientific notation
& square root function; c.1974
SR-50
One of the first scientific-function models, c.1974.
TI-30 Inexpensive
scientific, c.1976. Case & manual included. 