Disk Read Finished

If the disk has finished copying data into memory, then interrupt the computer. More formally,

if the following are true:

  • value of cell 49 at time t = 1
  • disk bytes read at time t = value of cell 46 at time t
  • value of cell 48 at time t = 0

then interrupt at index: 1 time: (t + 1) = 1

Setting the interrupt cell #1 to 1 indicates to the computer that the disk has finished the read operation.

For example,

if the following are true:

  • disk bytes read at time 165 = 3
  • value of cell 46 at time 165 = 3
  • value of cell 48 at time 165 = 0
  • value of cell 49 at time 165 = 1

then interrupt at index: 1 time: (165 + 1) = 1

Thus, the interrupt cell #1 value time 166 is 1.

Try running the simulator below to see interrupt cell #1 change to 1.

Time: 0
LW Computer IO Simulator

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