o Cassette Recorder number 2.

CAPABILITIES AND ADVANTAGES

The Interface allows you to add the following Radio Shack modules to
your system:

1. Screen Printer (26-1151)

2. Line Printer (26-1150)

3. Mini-Disk System (26-1160/26-1161)

4. Cassette Recorder number 2 (14-841)

The Screen Printer and Line Printer allow you to obtain hard copy
(printed) information generated by your TRS-80.

The TRS-80 Mini-Disk System is a small version of the floppy disk. It
provides vast storage space and much quicker access time than tape.
The number 1 disk contains about 80,000 bytes of free space for files.
Each additional disk has 89,600 bytes of file space. The Disk System
has its own set of commands that allow manipulation of files and
expanded abilities in file use. The TRS-80 Mini-Disk System uses
sequential or random access. The disks will allow use of several
additional LEVEL II commands.

=IMPORTANT NOTE=

Because of the presence of a Disk Controller in the Expansion
Interface, the computer will try to input the additional
commands.

When the Expansion Interface is connected to the computer, it
assumes that a Mini-Disk is connected. To use the Expansion
Interface without a Mini-Disk, press the BREAK key on the
TRS-80 keyboard. This will override the Mini-Disk mode and
allow normal LEVEL II operation.

The use of two cassettes allows a much more efficient and convenient
manner of updating data stored on tape. For example, if you have
payroll data stored on tape, the information can be read, one item at
a time, from Cassette Recorder number 1, then changed or added to and
written out on Cassette Recorder number 2. The example cited is a very
simple application; however, very powerful routines can be constructed
to allow input and output of data using two tapes simultaneously.

CAUTION

This unit is designed to be used with Level II only. =Do not
use with level I.=

[Illustration: FIGURE 1. Expansion Interface.*]

* Catalog Number Description RAM

26-1140 TRS-80 Expansion Interface 0K
26-1141 TRS-80 Expansion Interface 16K
26-1142 TRS-80 Expansion Interface 32K

SETTING UP

=Power Supplies and PCB Housing= (see Figure 2)

Remove the Power Supply Door (top right side). First connect one DC
power cord (DIN connector) to the Power connector on