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Routines
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670A: Handle up/accelerate input
Used by the routines at scan_cursor, scan_kempston, scan_sinclair and scan_keyboard.
Sets speed to SPEED_FAST and updates sound flags. Called when player presses up on joystick/keyboard.
handle_up 670A LD A,$04 Set speed to SPEED_FAST.
670C LD ($5F64),A
670F LD HL,$6BB0 Set SOUND_BIT_SPEED_CHANGED, clear SOUND_BIT_SPEED_NOT_FAST.
6712 SET 2,(HL)
6714 RES 1,(HL)
6716 RET
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