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Oldbitcollector

Keyboard Routines

Oldbitcollector
Feb 4th, 2022 (edited)
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6502 ACME Cross Assembler 0.24 KB | None | 0 0
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  1.  
  2. ; Simple keyboard routine.
  3. ; Ideal for menus, but not for game control.
  4.  
  5. scan
  6.     jsr scnkey  ;get key
  7.     jsr getin   ;put key in A
  8.  
  9. start
  10.     cmp #65     ;A - left
  11.     beq left
  12.    
  13.     cmp #68     ;D - right
  14.     beq right
  15.     jmp scan
  16.  
  17. left
  18.  
  19. right
  20.  
  21.  
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