Tandy 102 Service Manual page 9

1 RESET Switch : If the Tandy 102 "locks up" (i.e., the display "freezes" and all keys seem to be
inoperative), press this button to return to the Main Menu (start-up). It is not likely that the
Tandy 102 will lock-up when you are using the built-in applications programs, however, it may
occur with customized programs.
2 RS-232C Connector: Attach a DB-25 cable (such as Radio Shack Catalog Number 26-1408) to
this connector when you need to receive or transmit serial information. When you
communicating directly with another TRS-80 computer, a Null MODEM Adapter (26-1496) is
required. An 8" Cable Extender (26-1497) may also be required.
3 SYSTEM BUS Connector : Connect this connector to the TRS-80 Disk/Video interface
(26-3806), using the system bus cable.
4 PRINTER Connctor: For hard-copy printouts of information, attach any Radio Shack parallel
printer to this connector, using an optional/extra printer cable.
5 Direct-Connect MODEM (PHONE) Connector: When communicating with another computer via
the Tandy 102's built-in MODEM, connect the round end of the optional/extra MODEM cable
to this connector.
6 CASSETTE Recorder Connector : To save or load information, on a cassette
tape, connect the
cassette recorder here. An optional/extra cassette recorder (and cable) is required.
7 Bar Code Wand Connector : Attach the optional/extra bar code wand to this connector. Note
that special bar code reader software is required.
8 DIR/ACP Selector : This selector allows you to select either a direct or acoustic coupler
connection. If you are communicating with another computer over the phone lines via the
built-in, direct-connect MODEM, set this switch to the DIR position. If you are using the
optional/extra Model 100 Acoustic Coupler (26-3805), set this connector to the ACP position.
9 ANS/ ORIG Selector : If you are "originating" a phone call to another computer, set this switch
to ORIG. If another computer is calling your Tandy 102, set to ANS.
5 Direct-Connect
MODEM (PHONE) Connector
6 CASSETTE Recorder
Connector
4 PRINTER Connector
3 SYSTEM BUS Connector
1 RESET Switch
2 RS-232C Connector
Figure 1-2. Rear View
9 ANS/ORIG Selector
8 DIR/ACP Selector
7 Bar Code Wand
Connector
1-3