Routines
Prev: 8B46 Up: Map Next: 8B60
8B4A: A burst of noise on the speaker
Used by the routines at RUN_SCRIPT and HANDLE_EVENTS.
Input
B Length
NOISE 8B4A LD A,(BORDER) The border colour, with the MIC and speaker bits set.
8B4D AND $07
8B4F OR $18
8B51 LD C,A
NOISE_0 8B52 CALL RANDOM A random speaker bit, each time round: bit 4 of what RANDOM leaves in A.
8B55 AND $10
8B57 XOR C
8B58 OUT ($FE),A
8B5A DJNZ NOISE_0
8B5C LD A,C The border colour again, with the speaker bit set: unlike TONE, a burst leaves the speaker on.
8B5D OUT ($FE),A
8B5F RET
Prev: 8B46 Up: Map Next: 8B60