TRS-80 Expansion Interface - RDO

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The TRS-80 Expansion Interface consists of the Case, a DC Power Supply, a Ribbon Cable, a Cassette Recorder Jumper Cable and an additional Cassette Recorder Cable for Cassette Recorder number 2. Notice that the DC Power Supply is not installed in the Case upon receipt.

The Case houses the Expansion Interface Printed Circuit Board (PCB), two DC Power Supplies and provides a housing area for an additional expansion PCB. The Expansion Interface utilizes a real-time clock and contains sockets for the addition of up to 32K of RAM in 16K increments.

One DC Power Supply provides power to the PCB. The other one supplies power to the TRS-80. The Power Supplies are interchangeable.

The ribbon cable has 40-pin connectors on both ends and is used to connect the Expansion Interface to the TRS-80.

Our unit has catalogue number of 26-1140 and a serial number of 055079. This was kindly donated by Helen Williams

Date : 1978

Manufacturer : Radio Shack - Tandy

This exhibit has a reference ID of CH16832. Please quote this reference ID in any communication with the Centre for Computing History.

Scan of Document: TRS-80 Expansion Interface - RDO

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