Radio Shack TRS-80 26-3650 Service Manual page 13

Testing
Procedure
Save
the
test
program on
a cassette
tape through a
cassette tape interface unit
by
the
operation
SAVE
A
|EXE
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
Install a
RAM
module
into
the
test unit
(
PC- 4
).
Push the
ALL RESET
button
on
the
bottom
of the
test unit.
Connect the
PC
-
4 to a cassette
tape
interface
and
a
tape
recorder
which
contains
a test
program
cassette tape.
Load
the
test
program from
the cassette
tape
by
the operation
LOAD A EXE
After loading the Program change
the
PC- 4 to
WRITE
mode
by
the operation
MODE
1
and confirm
that the remaining
program
step
is
789.
Operate
[MODE]
O (RUN mode
selection).
Execute
PO
(Program
numberO).
Confirm
the display
"TEST
1
OK".
Clear the
programs
POto
P5.
Example
to
clear
P2
.
. .
(a)
SHIFT
2 (P2 designation)
(b)
MODE
1
(WRITE mode
selection).
(c)
CLEAR
jEXEj
(erasing
P2)
Note:
SHIFT
is
the
red
S
button.
Change
the
PC-4
to
RUN
mode
by
[MODE!
[EXEJ.
Operate
DEFM
176 |EXE
Execute
P9.
Confirm
the display
"TEST
OK!
-
12-