I wrote a monitoring system for a Water Meter Calibration facility back in 1990. They contacted me in about 2008 to help get it running again after some hardwar

I wrote a monitoring system for a Water Meter Calibration facility back in 1990. They contacted me in about 2008 to help get it running again after some hardware was replaced, and it wouldn't work. It turns out they had the two parallel cables swapped. As far as I know, that MS-DOS Turbo Pascal code, with built-in multitasking, is still in use, quietly doing it's job as a Man-Machine Interface.