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6FDB: 'M' pressed - toggle message speed
The address of this routine is found in the table of keypress handling routines at ED00. It is called from the main loop at F02B when 'M' is pressed.
6FDB LD A,($6FC4) Toggle the message display interval at 6FC4 between 4 (fast) and 7 (slow)
6FDE XOR $03
6FE0 LD ($6FC4),A
6FE3 JP $ECEE Make a sound effect
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