LSM timing program: The older Letter Sorting Machines at the USPS have
analog meters to show machine speed in letters-per-minute. Many grievances
were filed when the meters were inaccurate and the machines were running
in excess of 60 LPM. Conversely, each LPM it showed short would reduce
throughput by 720 letters per hour. I reverse-engineered the ROM-based
TMS9900 software and wrote a routine to time the machine precisely using
the computer clock, then the analog meter would be set to that speed.