Texas Instruments TI 503


Brand: Texas Instruments
Model: TI 503
Type: Calculator
Picture: TI-503+
Batteries: 189 x 1
Lifetime: Introduced: 1994
Terminated: unknown
Notes: Plain calculator with rounded edges. This calculator has basic functions and constant memory. The keyboard has a nice feel. The calculator has thousands' marks to make the readout of large numbers easier.

As with its successors, the TI-503+ and the TI-503SV, the case is very hard to open when the battery needs replacement.