Comment by eesmith

To save you either needed a cassette recorder, plugged into the machine with a special cable, then "SAVE CS1" and follow the instructions. (Start recording, the TI plays sound to the output port, which gets stored on tape. Use "LOAD CS1" to load from cassette, after rewinding to the start of the program.)

Or you needed an expansion box, with a floppy drive, in which case you could do "SAVE DSK1,PROGNAME" to save to "PROGNAME" on the first disk. I didn't have an expansion box.

Neither would have come with the base computer.