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Oct 8th, 2018
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  1.     lda     SWCHA
  2.     lsr
  3.     lsr
  4.     lsr
  5.     lsr
  6.     and     #%11
  7.     ldy     lastTrack
  8.     sta     lastTrack          
  9.     eor     NextTrackTbl,y  
  10.     beq     .down          
  11.     eor     #%11
  12.     bne     .endTC        
  13. .up:                        
  14.     ...
  15. .down:                  
  16.     ...
  17. .endTC
  18.     ...
  19. NextTrackTbl
  20.     .byte   %01
  21.     .byte   %11
  22.     .byte   %00
  23.     .byte   %10
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