Read by the routines at EDITOR, ED_EDIT, ED_DOWN, ED_UP, ED_SYMBOL, SET_HL, OUT_LINE, LN_FETCH, OUT_SP_2, NEXT, IN_ASSIGN and LET, and updated by the routines at MAIN_EXEC, VAR_A_1 and INPUT. This system variable is accessed by most routines via the IY register at IY+$37.

Bit	Description
0	Set when dealing with a complete simple string
1	Set when dealing with a new (rather than existing) variable
2	Unused
3	Unused
4	Unused
5	Reset when in editing mode, set when in INPUT mode
6	Unused
7	Set when dealing with INPUT LINE