Abstract: A digitizer, which comprises integrated circuit cards designed to attach to an expansion slot in an IBM PC/AT, operates at 20 megasamples per second for approximately 52 milliseconds and provides eight bit resolution on the signal input. The computer software includes a device driver for the digitizer. A flash analog-to-digital converter (ADC) in a single IC package has an analog input coupled to the video signal source. The data line from the ADC circuit goes to a SRAM (Static Random Access Memory) memory made up of four identical banks which are interleaved together so that slower less costly memory chips can be used. An interface circuit provides communication between the computer and the digitizer, with address, data and control lines. A sync pulse from the video tape unit is monitored by a sync pulse input comparator to trigger the start of a digitizing sequence.