ROLM PBX Interface Card 8 Channel Line Interface Circuit Board 1979 Vintage PCB

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ROLM 8 Channel Line Interface M/N 85540A Vintage PCB Data General

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ROLM 8 Channel Line Interface M/N 85540A S/N 71628216 Vintage PCB Data General

ROLM 8 Channel Line Interface M/N 85540A S/N 71628260 Vintage PCB Data General

ROLM 8 Channel Line Interface M/N 85540A S/N 71626622 Vintage PCB Data General