git.sur5r.net Git - cc65/blob - libsrc/pce/ticktock.s

   1         .interruptor    ticktock, 24
   2
   3         .include        "pce.inc"
   4         .include        "extzp.inc"
   5
   6 ticktock:
   7         bbr5    vdc_flags,@s1   ; not vertical-blank interrupt
   8
   9         ; Increment the system tick counter.
  10         inc     tickcount
  11         bne     @s1
  12         inc     tickcount+1
  13         bne     @s1
  14         inc     tickcount+2
  15         bne     @s1
  16         inc     tickcount+3
  17
  18 @s1:    rts