300 BPS DCM-1 Modem  (260-1172)      Features          Faxback Doc. # 5973

The Modem I is a self-contained, FSK (Frequency Shift Keying) telephone
interface. It enables your computer to communicate with other computers via
ordinary telephone lines. The Modem I is compatible with all TRS-80 models
(except Level I versions of the Model I and Model III) and with other RS-
232C standard devices.

Its special features include:

* Sends/receives at 0-300 baud for compatibility with most time-shared
  computer systems.

* Selectable originate/answer mode for operation in "remote" or "host"
  terminal applications.

* Full duplex operation allows simultaneous communication between modems.

* Direct (non-acoustic) connection to phone lines helps ensure a low error
  rate.

* Normal/Cassette switch lets you use RS-232C equipped computers and TRS-80
  Model I Level II computers which do not have an RS-232C interface. Select
  NORM for RS-232C use; CASS for use with the cassette interface of Model I
  Level II Computers. Cassette use requires option/extra "Cassette-Comm"
  software (26-1139) and a cassette cable (26-3009).

* Bell 103 compatible.

NOTE: When using the Cassette Comm software, communications will not be in a
true full duplex mode. For further details, see the Cassette Comm instruct
ion manual.

IMPORTANT NOTE

Before connecting your Modem I to the phone lines, you must notify your 
local telephone company of the:

Manufacturer: Radio Shack
Model: Modem I, # 260-1172
USOC NUMBER: AAO99R-69525-DM-N
RINGER EQUIVALENCE NUMBER (REN): 0.0B
This information also appears on the bottom of the Modem.

The Modem I must not be connected to:

* Coin Operated phones
* Party-line telephones
* Multiple-line telephones

(css 08/04/93)