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7AB9: Initial game setup
Displays the control selection dialog, waits for user input (or times out to overview mode), then shows the game mode dialog. Stores the selected control type in tmp_control_type, overview flag in state_overview_mode, and game mode in state_game_mode. Uses a stack trick: sets SP to setup_sp so RET jumps to start_gameplay_or_overview.
setup 7AB9 LD DE,$7A2E Print control types dialog
7ABC LD BC,$008B
7ABF CALL $203C
7AC2 LD HL,$FFFF Initialize timer
7AC5 LD ($7802),HL
7AC8 LD A,$0D
7ACA LD ($5C08),A
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