Resetting the Display Character Count

If the display has finished drawing, then reset the number of characters read to 0. More formally,

if the following are true:

  • value of cell 27 at time t = 1
  • number of characters read at t = value of cell 26 at time t

then number of characters read at (t + 1) = 0

Reset the number of characters read so that the next time the computer asks the display to draw characters, the count starts at 0.

For example,

  • value of cell 27 at time 12 = 1
  • number of characters read at 12 = 1
  • value of cell 26 at time 12 = 1

Since the "number of characters read" is equal to the value in cell #26, we can conclude: number of characters read at 13 = 0

Try running the simulator below to see the display reset "characters read" after it is done.

Time: 0
LW Computer I/O Simulator

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