Read by the routines at K_DECODE, ED_ERROR, MAIN_EXEC, OUT_CURS, OUT_SP_2 and INPUT, and updated by the routines at PO_ANY, CL_ALL, CLEAR_PRB, KEY_INPUT, CHAN_FLAG, CHAN_K, AUTO_LIST and OUT_LINE. This system variable is accessed by most routines via the IY register at IY+48.

Bit	Description
0	Reset when the screen is clear
1	Set when the printer buffer is in use
2	Set when in quotes during line parsing
3	Set when CAPS LOCK is on
4	Set when using channel K (keyboard)
5	Unused
6	Unused
7	Unused