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Function keys

Graphics XIO commands Function keys 6502 opcodes File systems
Joystick Memory map Music/sound Display list I/O errors
Player/Missile Character set File formats Display list interrupts (DLI) Vertical blank interrupts (VBI)

Incorporating the "Start", "Select" and "Option" key

Keys Pressed PEEK(53279) Binary Code
None 7 00000111
START 6 00000110
SELECT 5 00000101
START and SELECT 4 00000100
OPTION 3 00000011
START and OPTION 2 00000010
SELECT and OPTION 1 00000001
All Three 0 00000000

Incorporating the "Help" key

To clear the HELP key, POKE 732,0. To read that key. PEEK(732). A 17 represents the HELP key, an 81 represents SHIFT - HELP, and a 145 means CONTROL - HELP

Keys Pressed PEEK(732)
HELP 17
SHIFT - HELP 81
CONTROL - HELP 145