Digital PDP-9 Analog-to-Digital Converter (?)

Digital PDP-9 Analog-to-Digital Converter (?)

This is a marketing photograph of a late 1960s / early 1970s Digital Equipment Corporation computer module. While no model number is visible, based on labeling and other photographs that accompanied it, it appears to be a PDP-9 A-D Converter Option: an I/O device that allows the acquisition of analog signals and converting them to digital data. Target market for the PDP-9 was laboratory instrumentation, nuclear physics experiments, and industrial data acquisition so this seems to be a likely identification.

The indicator lights: ADC OV (overflow), ADC FLAG, DATA REQ, CLOCK correspond to common functions in a device that samples analog data (possibly on a certain interval) and supplies the converted value when the computer is ready.

Digital Equipment Corporation

ca 1967

Charles Valentine

2026.68