155-0015-01
The Tektronix 155-0015-01 (M020F) is a Tek-made analog data switch chip for the 7000 series readout system in a 16-pin DIP, designed by Barrie Gilbert.
It accepts nine inputs at currents from 0 to 1 mA and selects one under the control of a BCD code. The output is from an NPN collector.
The inputs are virtual grounds within ±100 mV of ground potential for the input range of ±1 mA.