Tandy Direct Connect 26-2228 User manual

TANDY
Direct Connect
Modem Pak
OPERATION MANUAL
cat. no. 26-2228

The FCC Wants You to Know
This equipment generates and uses radio frequency energy. If not installed and used
properly, that is in strict accordance with the manufacturers instructions, it may cause
interference to radio and television reception.
It has been type tested and found to comply with the limits for aClass Bcomputing
device in accordance with the specifications in Subpart Jof Part 15 of FCC Rules which
are designed to provide reasonable protection against such interference in aresidential
installation. However, there is no guarantee that interference will not occur in aparticular
installation.
If this equipment does cause interference to radio or television reception, which can
be determined by turning the equipment off and on. the user is encouraged to try to cor-
rect the interference by one or more of the following measures:
•Reorient the receiving antenna
•Relocate the computer with respect to the receiver
•Move the computer away from the receiver
•Plug the computer into adifferent outlet so that computer and receiver are on dif-
ferent branch circuits.
If necessary, you should consult the dealer or an experienced radio television technician
for additional suggestions
Warning
This equipment has been certified to comply with the limits for aClass Bcomputing de-
vice, pursuant to Subpart Jof Part 15 of FCC Rules. Only peripherals (computer input
output devices, terminals, printers, etc.) certified to comply with the Class Blimits may
be attached to this computer. Operation with non-certified peripherals is likely to result in
interference to radio and TV reception.

TERMS AND CONDITIONS OF SALE AND LICENSE OF TANDY COMPUTER EQUIPMENT AND SOFTWARE
PURCHASED FROM RADIO SHACK COMPANY-OWNED COMPUTER CENTERS, RETAIL STORES AND
RADIO SHACK FRANCHISEES OR DEALERS AT THEIR AUTHORIZED LOCATIONS
LIMITED WARRANTY
CUSTOMER OBLIGATIONS
ACUSTOMER assumes lull responsibility that this computer hardware purchased (the "Equipment"), and any copies ol software included
with the Equipment or licensed separately (the "Software") meets the specitications, capacity, capabilities versatility and other
requirements ot CUSTOMER
BCUSTOMER assumes lull responsibility lor the condition and effectiveness of the operating environment in which the Equipment and
Software are to function, and for its installation,
LIMITED WARRANTIES AND CONDITIONS OF SALE
AE,or„a„pe,ic"1ot ninely (90) ca,endar "ays ,rom lne "ale ol me Radio Shack sales document received upon purchase ol the Equipment
RADIO SHACK warrants to the original CUSTOMER that the Equipment and the medium upon which the Software is stored is free from
manufacturing defects This warranty It only applicable to purchases ol Tandy Equipment by the original customer from Radio Shack
company-owned computer centers, retail stores, and Radio Shack franchisees and dealers at their authorized locations The warranty
is void it the Equipment's case or cabinet has been opened, or if the Equipment or Software has been subjected to improper or abnormal
use If amanufacturing defect is discovered during the stated warranty period, the defective Equipment must be returned to a Radio Shack
Computer Center, aRadio Shack retail store, aparticipating Radio Shack tranchisee or aparticipating Radio Shack dealer for repair along
with acopy of the sales document or lease agreement. The original CUSTOMER'S sole and exclusive remedy in the event ot adetect is
limited to the correction of the defect by repair, replacement, or refund of the purchase price, at RADIO SHACKS election and sole
expense. RADIO SHACK has no obligation to replace or repair expendable items
BRADIO SHACK makes no warranty as to the design, capability, capacity, or suitability for use of the Software, except as provided in this
paragraph Software is licensed on an "AS IS" Basis, without warranty The original CUSTOMER'S exclusive remedy in the event of a
Software manufacturing defect, is its repair or replacement within thirty (30) calendar days of the date of the Radio Shack sales document
received upon license of the Software The defective Software shall be returned to aRadio Shack Computer Center aRadio Shack retail
store, aparticipating Radio Shack tranchisee or Radio Shack dealer along with the sales document
CExcept as provided herein no employee, agent, franchisee, dealer or other person is authorized to give any warranties of any nature on
behalf of RADIO SHACK.
D, EXCEPT AS PROVIDED HEREIN, RADIO SNACK MAKES NO EXPRESS WARRANTIES, AND ANY IMPLIED WARRANTY OF
KL^J^T/t^ PURP0SE IS UM,TED IN ITS DURATION TO THE DURATION OF THE WRinEN
LIMIIcP WARRANTIES SET FORTH HEREIN.
ESome states do not allow limitations on how long an implied warranty lasts, so the above limitation(s) may not apply to CUSTOMER
LIMITATION OF LIABILITY
AV&ll A
„l P J2SY!SEP.,.S EHl!!i' R „
ADI°SHACK SHALL HAVE N0 LIABILITY OR RESPONSIBILITY TO CUSTOMER OR ANY OTHER
P
™,!?^E vN^,,,S# L0SS WDAMAGE CAUSED 0R ALLEGED T0 BE CA"SED DIRECTLY OR
mS?6?1™".^".^^^^, ,? SPSSSHE S0 ,LD 'LEASED 'LI«"SED OR FURNISHED BY RADIO SHACK, INCLUDING, BUT NOT
ffiE T
D,yPc»A
„N ^BUSINESS 0R ANTICIPATORY PROFITS OR CONSEQUENTIAL DAMAGES
SS^IK? S°H.IHLUSE 0R OPERATION OF THE "EQUIPMENT" OR "SOFTWARE." IN NO EVENT SHALL RADIO SHACK BE LIABLE
ffi5,J*B5, APHOFIT8'0R ANY '"DIRECT, SPECIAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF ANY BREACH OF THIS
THE"WptJEHT' ORI"0FTWARER!?ING 0UT °F°RC0NNECTED WITH THE SALE 'LEASE'LICENSE 'USE 0R ANTICIPATED USE OF
SS^IESISSP'BS T n1E uA =l
0V
JuL ^ITAIl
0N
JL
A
/lD*arranties, RADIO SHACKS LIABILITY HEREUNDER FOR DAMAGES INCURRED
BIn™T
.°»MERuSR,.°c
T
„
HERS SHALL N0T EXCEED THE AM0UNT PAID BY CUSTOMER FOR THE PARTICULAR "EQUIPMENT" OR
SOFTWARE INVOLVED.
BRADIO SHACK shall not be liable for any damages caused by delay in delivering or furnishing Equipment and/or Software
CNo action arising out of any claimed breach of this Warranty or transactions under this Warranty may be brought more than two (2) years
after the cause of action has accrued or more than four (4) years after the date ot the Radio Shack sales document' for the Equipment or
Software, whichever first occurs.
DSome states do not allow the limitation or exclusion of incidental or consequential damages, so the above iimitation(s) or exclusion(s) mav
not apply to CUSTOMER
SOFTWARE LICENSE
RADIO SHACK grants to CUSTOMER anon-exclusive, paid-up license to use the TANDY Software on one computer subject to the followino
provisions: M
AExcept as otherwise provided in this Software License, applicable copyright laws shall apply to the Software
B. Title to the medium on which the Software is recorded (cassette and/or diskette) or stored (ROM) is transferred to CUSTOMER but not
title to the Software
CCUSTOMER may use Software on one host computer and access that Software through one or more terminals if the Software permits this
function. K
D. CUSTOMER shall not use, make, manufacture, or reproduce copies of Software except for use on one computer and as is specifically
provided in this Software License Customer is expressly prohibited tram disassembling the Software
ECUSTOMER is permitted to make additional copies of the Software only for backup or archival purposes or it additional copies are required
lr
nJ!5,,,P?aIIon °' SI,^iSmEu,er wi,h lne Software, but only to the extent the Software allows abackup copy to be made However for
TRSDOS Software, CUSTOMER is permitted to make alimited number of additional copies for CUSTOMER'S own use
F, CUSTOMER may resell or distribute unmodified copies of the Software provided CUSTOMER has purchased one copy of the Software for
each one sold or distributed The provisions of this Software License shall also be applicable to third parties receiving copies of the
Software tram CUSTOMER.
G. All copyright notices shall be retained on all copies of the Software
APPLICABILITY OF WARRANTY
A. The terms and conditions of this Warranty are applicable as between RADIO SHACK and CUSTOMER to either asale ol the Equipment and
KiSRIfAo nse t0 CUST0MER "< t» atransaction whereby Radio Shack sells or conveys such Equipment to athird party for lease to
LUblUMEH.
B. The limitations of liability and Warranty provisions herein shall inure to the benefit of RADIO SHACK, the author owner and or licensor of
the Software and any manufacturer of the Equipment sold by Radio Shack.
STATE LAW RIGHTS
The warranties granted herein give the original CUSTOMER specific legal rights, and the original CUSTOMER may have other rights which vary
from state to state.

Important Note
Vour Modem Pak has been designed and constructed to conform to federal regulations and can be con-
nected to the phone line as described in this manual.
Please note that each product connected to the telephone line places acertain load on the line. We desig-
nate this as the unit's "Ringer Equivalence Number."
When using more than one product on the line, total all the ringer equivalence numbers. If they total more
than 5, your phone may not ring. In rural areas atotal of 3may impair ringer operation. To be sure, check
with your local telephone company.
The registration number as well as ringer equivalence number appears on the bottom of the unit.
The Modem Pak must not be connected to:
•Coin-operated phones
•Party-line phones
IMPORTANT INFORMATION
It is very unlikely .. . but if your Modem Pak causes problems on the phone line, the telephone company
has the right to temporarily discontinue your service. If this happens, the telephone company will notify
you and give you achance to have the problem corrected. Also, the telephone company has the right
to make changes in their lines and/or equipment. If these changes affect your Modem Pak or require
changes in its connection, the phone company will notify you in writing so you can take the necessary
steps to insure uninterrupted service.
Direct Connect Modem Pak Operation Manual
©1985 Tandy Corporation, Fort Worth, Texas 76102 U.S.A.
All Rights Reserved.
Reproduction or use, without express written permission from Tandy Corporation,
of any portion of this manual is prohibited. While reasonable efforts have been taken
in the preparation of this manual to assure its accuracy, Tandy Corporation assumes
no liability resulting from any errors or omissions in this manual, or from the use
of the information contained herein.
10 987654321

Contents
Introduction 1
1Description of the Modem Pak 3
2Installation 5
3How to use your Modem Pak 9
4Sample log-on session 21
5Special character codes 23
6Technical information 25
7Programming examples 29
8Troubleshooting and maintenance 33
9Specifications 35
10 Schematic diagram 37

Introduction
Tandy's Direct Connect Modem Pak opens the door to the world of
telecommunications. This 300-baud Modem Pak allows you to send
and receive programs, but you can also use it to contact information
services.
The DC Modem Pak is easy to use because it is designed to plug directly
into the cartridge slot on the right side of your Color Computer, or
into the Multi-Pak Interface (26-3124).
Special features include:
•Selectable word size, parity, and stop bit.
•Full- or half-duplex capability.
•True upper- and lowercase capability (only with these Color Com-
puters: 26-3127B, 3134B or 3136B).
•Acassette recorder and printer can be operated without going back
into BASIC mode.
•Special codes can be generated to edit transmit data and to create
OS-9 characters.
To use the Modem Pak, you'll need a:
•Tandy Color Computer with at least 16K of RAM.
•Color TV (such as Radio Shack Cat. No. 16-232).
•Telephone.
•Cassette recorder. To transmit apreviously written BASIC program
or data, you'll need to load the program into the Color Computer's
memory from acassette recorder, such as Tandy's CCR-81 (26-1208)
or CCR-82 (26-1209).
•Serial printer. You can print out received information while host-
to-computer communication is in progress. Use aserial interface
printer that is compatible with your Color Computer. Radio Shack
has aline of Color-Computer-compatible serial printers, from the
Thermal Printer TP-10 (26-1261) to the Daisy Wheel Printer DWP-220
(26-1278).

Description of the Modem Pak 1
(T) Carrier detect indicator. This indicator lights while the Modem Pak
is receiving acarrier tone.
(2) Line ON indicator. This indicator lights when the Modem Pak is
connected to the telephone line and the CONNECT switch is
pressed to the ON position.
(3) CONNECT switch. This switch connects the Modem Pak to the
telephone line. Press this switch to transmit or receive data from
the telephone line.
(4) ANSWER/ORIGINATE switch. Slide this switch to the ANSWER
position to set the Modem Pak to answer mode. Slide it to the
ORIGINATE position to set the Modem Pak to originate mode.
(5) PHONE jack. Connect to aduplex jack using modular-to-modular
cable. For further information, refer to the Installation section of
this manual.
Figure 1