
__interrupt(rom_sys_c64) void irq()
irq: scope:[irq]  from
  [0] *BG_COLOR = 1
  [1] *BG_COLOR = 0
  to:irq::@return
irq::@return: scope:[irq]  from irq
  [2] return 
  to:@return

void main()
main: scope:[main]  from
  asm { sei  }
  [4] *KERNEL_IRQ = &irq
  asm { cli  }
  to:main::@return
main::@return: scope:[main]  from main
  [6] return 
  to:@return
