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96DE: Play an intro message sound effect
Used by the routine at 87CA.
A Value between 0x32 and 0x51
96DE LD E,A Save the value of A in E for later retrieval
96DF LD C,$FE We will output to port 0xFE
96E1 LD D,A Copy A into D; bits 0-2 of D determine the initial border colour
96E2 RES 4,D Reset bit 4 of D (initial speaker state)
96E4 RES 3,D Reset bit 3 of D (initial MIC state)
96E6 LD B,E Initialise B (delay counter for the inner loop)
96E7 CP B Is it time to flip the MIC and speaker and make the border black?
96E8 JR NZ,$96EC Jump if not
96EA LD D,$18 Set bits 3 (MIC) and 4 (speaker) of D, and reset bits 0-2 (black border)
96EC OUT (C),D Set the MIC state, speaker state and border colour
96EE DJNZ $96E7 Jump back until the inner loop is finished
96F0 DEC A Is the outer loop finished too?
96F1 JR NZ,$96E1 Jump back if not
96F3 RET
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