Routines
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A427: A rising sweep
Used by the routine at SERF_FIRE.
Sixteen calls to BEEP with the pitch walked from one end to the other, so the note climbs. Measured at roughly 16 milliseconds, sweeping from about 500 Hz upwards. Reached from the serf's handler by way of SERF_FIRE.
SOUND_SWEEP_UP A427 LD D,$10 Sixteen steps.
SOUND_SWEEP_UP_0 A429 LD A,D The pitch for this step, derived from the step number.
A42A RLCA
A42B RLCA
A42C XOR $07
A42E RLCA
A42F RLCA
A430 LD B,A
A431 CALL BEEP One short note.
A434 DEC D
A435 JR NZ,SOUND_SWEEP_UP_0
A437 RET
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