Variable speed printing for dot matrix printers

Abstract From the Canadian patent

Abstract of the Disclosure, A variable speed printing (VSP) adaptor for a dot matrix printer which includes a monitoring means having a plurality of devices each capable of assuming one of two states. The monitoring means monitors the state of the pattern data to be printed, and, in the preferred embodiment, the monitoring means comprises a counter which is preset with a number equal to the number of column scans with a dot print line. The pattern data to be printed is scanned in a forward direction i.e. in, the normal printing direction starting at the first print position and the count in the counter is decremented one count for each column data scanned. During the time interval between …