The Project Gutenberg EBook of Radio Shack TRS-80 Expansion Interface:
Operator's Manual, by Anonymous

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Title: Radio Shack TRS-80 Expansion Interface: Operator's Manual
Catalog Numbers: 26-1140, 26-1141, 26-1142

Author: Anonymous

Release Date: December 9, 2008 [EBook #27469]

Language: English

Character set encoding: ASCII

*** START OF THIS PROJECT GUTENBERG EBOOK RADIO SHACK TRS-80 EXPANSION ***

Produced by Gerard Arthus, Diane Monico, and the Online
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[Illustration: Radio Shack

TRS-80

EXPANSION
INTERFACE]

Radio Shack

TRS-80

EXPANSION
INTERFACE

_SEE CAUTION INSIDE COVER_

Catalog Numbers 26-1140
26-1141
26-1142

=Operator's Manual=

CUSTOM MANUFACTURED IN U.S.A. FOR RADIO SHACK [TC] A DIVISION OF TANDY CORPORATION

INTRODUCTION

The TRS-80 Expansion Interface (see Figure 1) 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. It must be installed using the procedures under the heading
"SETTING UP" and as illustrated in Figure 2.

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. You received hoods for
these connectors which are covered later in this manual.

The Cassette Recorder Jumper Cable has 5-pin audio DIN connectors on
both ends. It connects between the Expansion Interface Tape
input/output (I/O) and the TAPE connector on the right rear of the
TRS-80 Microcomputer.

The Cassette Recorder Cable is provided to connect the Expansion
Interface t