Data representative of Korotkoff sounds and corresponding applied cuff pressures is stored in both digital form in a semiconductor random access memory (132) and in analog form on a serial magnetic tape recorder (112).

In an integrated semiconductor store with a parallel testing facility, the bit lines BL, B^¨B7L^¨B7 of each pair of internal bit lines BL, B^¨B7L^¨B7 are driven independently of each other.