Epson CX-21 Acoustic Coupler

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An acoustic coupler is a device that allows a computer to transmit data over a standard telephone line by converting digital signals into audible tones and sending them through a telephone handset's speaker and microphone. The coupler physically holds the handset in rubber cups to minimise background noise and ensure sound transmission.

Epson CX-21 specifications:

Manufacturer: Epson
Model: CX-21
Speed: 300
Transmission Standards: V21
Interface: RS232
Build Date: 1984
Power: battery or mains adaptor

Serial No: 011522

Our model was kindly donated by Peter Martin.

Date : 1985

Manufacturer : Epson

Physical Description : Acoustic coupler, AC adaptor

This exhibit has a reference ID of CH13106. Please quote this reference ID in any communication with the Centre for Computing History.