A character class memory containing simple CCLs represented by encoding contained symbols or minimum and maximum symbols of a range, complex CCLs represented by bit-masks indicating contained symbols, and equivalence class maps represented as tables of ED values for each symbol value. A leader pin is secured to a free end of the magnetic tape and engageable with the tape catch member when the length of magnetic tape is to be drawn out of the cartridge housing and into the tape drive. The terminal is further configured to display symbols at positions on the display corresponding to the key positions on the frame.