Abstract: In a system for generating a vector representation of a waveform on a cathode ray tube screen, the minimum and maximum magnitudes of an analog waveform acquired during each of successive measurement periods are stored in a random access memory, with the minimum and maximum signal values for each measurement period being stored in arbitrary order. The minimum and maximum signal values within each measurement period are then time sequenced by selectively comparing the minimum and maximum values obtained during each such measurement period with the values obtained during preceding and/or succeeding periods. Also according to these selected maximum and minimum comparisons, the maximums obtained during selected measurement periods are decremented by a selected amount while minimums obtained during selected periods are incremented by a selected amount.