Routines
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97AB: Reset sound buffer, volume channels and check for FIRE key
Used by the routine at 9470.
97AB XOR A Reset temporal buffer at A22C
97AC LD ($A22C),A
97AF CALL $D36F Reset channel volumes of the AY-3-8912
97B2 LD DE,$C350 Set DE to count 50.000 loops
97B5 DEC DE Decrement counter
97B6 LD A,D Counter is 0?
97B7 OR E
97B8 RET Z Return if so
97B9 LD B,$1E Wait some time
97BB DJNZ $97BB
97BD CALL $A61F Check for FIRE key press
97C0 JP NZ,$97B5 Jump back if not pressed
97C3 CALL $A61F Check for FIRE key press
97C6 JP Z,$97C3 Jump back until FIRE key not pressed
97C9 CALL $D346 Reset sound data buffer
97CC LD A,$01 Set $01 to temporal buffer at A22C meaning fire pressed
97CE LD ($A22C),A
97D1 RET
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