HP 54501A 54501-90901 Digitizing Oscilloscope Programming Reference 1988

HP 54121T Hewlett Packard Digitizing Oscilloscope Programming Reference #1899

VTG HP 54501A Digitizing Oscilloscope Programming Reference Guide / Manual 1988

HP 54121-90907 54121T Digitizing Oscilloscope Programming Reference Manual

HP 54501A 54501-90907 Digitizing Oscilloscope Programming Reference Manual 1989

Agilent HP Keysight 54121-90907 - 54121T Programming Reference Manual

HP 54121T Digitizing Oscilloscope Front-Panel Operation Reference Manual