- Description of the transmission keys K1 - K3, F1 - F3, ENTER

 K1   General return key
 K2   Interrupt Connection or program
 K3   Command memory / Job Report / Test compare / Search + Replace
 F1   Return to EDT / Return and send the data entered
 F2   File name overwriteable for Rename / Display:  Enable Modify mode
 F3   Hardcopy / Batch mode for RES command
 Shift ENTER Scroll backwards in Command memory
 EM   Notes on using the End marker (EM)