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$BA90: Initialise the tune buffer
Used by the routines at $BA00 and $BA48.
$BA90 LDA #$B4 Prepare to address the tune buffer at $BBB4.
$BA92 STA $4E
$BA94 LDA #$BB
$BA96 STA $4F
$BA98 LDY #$00 Fill the buffer with zeroes.
$BA9A TYA
$BA9B STA ($4E),Y
$BA9D INY
$BA9E CPY #$20
$BAA0 BNE $BA9B
$BAA2 RTS
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