53279 $D01F CONSOL

Read

Used to look up if any of the 3 console keys (START, SELECT, OPTION) has been pressed (RESET is not a console keys, neither is HELP)

START    Bit 0    PEEK(53279)=6
SELECT   Bit 1    PEEK(53279)=5
OPTION   Bit 2    PEEK(53279)=3

Write

The built in speaker clicks (only on 400/800 computers)