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EB53: Data buffer - music and sound effects
EB53 DEFB $00 Temporary store for the speaker/sound byte used in the music playing routine at E5B6.
EB54 DEFW $0000 Store for note data pointer, for music playing routine at E5B6.
EB56 DEFB $00 Counter/length/frequency used for the generic sound effect routine at C07A
EB57 DEFW $0000 Store to preserve HL register pair, for sound playing routine at E1D7.
EB59 DEFW $0000 Address pointer to the ROM to generate semi-random byte values to play generic sound effects at E1D7.
Reset to 0 at the start of the game loop at C7D4
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