Interrupt, 26 , 35 , 35 , 207 , 217 
  8520, 251 
  audio, 147 , 148 , 153 , 157 , 164-165 , 220 
  beam synchronized, 3 
  blitter, 35 , 171 , 187 , 220 
  control registers, 217 
  copper, 25 , 32 , 216 , 219 
  disk, 220 , 245 , 250 
  external, 219 
  graphics, 33 
  interrupt enable bit, 218 
  interrupt lines, 217 
  maskable, 217 
  nonmaskable, 217 
  parallel, 259 
  priorities, 221 
  registers, 218 
  serial, 255 , 256 , 258 
  serial port, 220 
  setting and clearing bits, 218 
  vertical blanking, 219