Texas Instruments 58c and 59 calculators

The 59( in the cradle) and it's little brother 58C beside it.

COMMENTS

The 2 of these look identical and essentially, they are with the exception of the 59's card reader and the amount of memory available on the 59.

Usually these are found with the print cradle as shown.

Given the price of the 59, it is surprisingly common.

 

There at the very bottom is the cartridge port.  Same place for both calcualtors.  There were a plethora of cartridges made for these 2 giving it an extremely wide user base.