Radio Shack TRS-80 Model 100 - Experiment 1: Entering a Command

V
2.
Connectors
,
Switches
and
Contrast
Volume
(1)
Connectors
RS-232C
25
pins
(DB-25S)
Printer
26
pins
(FRC2-C26-L13-ON)
Modem
8
pins
(TCS-4490)
Cassette
8
pins
(TCS-4480)
Bar
Code Reader
9
pins (A-7224)
System Bus
40
pins
(IC
Socket)
AC Adaptor
s.S<P
(Center
Minus)
C
2)
Switches
(a)
Power
Switch
This is
the PPC
system
power
switch.
OKJ
IflD
OFF
ON
ED
OFF
Power
OFF
Power
ON
Fig.
1
(b)
ANS/CALL
selector
This switch
is
used
to
select
the MODEM
ANSWER
mode
or
CALL
mode.
ams
j (HDi
oRiq-
AWS
ED
0RI6-
Call mode
Answer
mode
Fig.
2
(C) Coupler/telephone
selector
This
switch
is
used
to
select
COUPLER
(acoustic
coupler
connection)
or
TELEPHONE
(direct
connection)
.
DfR
M
Acp
DIR
ED
acp
COUPLER
(ACOUSTIC
TELEPHONE
(DIRECT
TELEPHONE
COUPLER
CONNECTION)
LINE
CONNECTION)
Fig.
3