Radio Shack TRS-80 Model III - Power-On and Start-Up

OPERATION
3 / Operation
Power-On
The following
instructions explain
how to start
up and use the
Model III
as a
ROM-based
system only.
If
you have
a
Disk System
and are going
to load TRSDOS, follow
the power-up
instructions
given in
the Model
HI Disk System Owner's
Manual. If you have
a
Disk
System
but you are not
going to load
TRSDOS, read the instructions
later in this
chapter.
The
Computer and all
peripherals must
be off.
First
turn on all
peripherals,
then turn on the Computer. ( If you have
all the
components
connected
to a power strip, just turn on
the
power strip.
)
After
a
few seconds
,
the following
message should
appear on the Video
Display:
Cass?
The meaning
of this message
will be explained later.
If the
message does not
appear:
A. The Video Display
may need Brightness
or Contrast
adjustment.
See Figure 1
for location
of these controls
.
B. If
the message still
doesn't appear,
then turn off the entire
system, recheck
all
connections,
and
try again. For
further assistance, see
"Troubleshooting
and
Maintenance."
Do not turn any
peripherals
off while the Computer is
in use; to
do so could cause
abnormal
operation (the Computer
could restart
or
'
'hang up" , requiring
you to
reset or
turn the system off and
on again)
.