Dram2; Ecpu Rami - Radio Shack TRS-80 26-3650 Service Manual

C.
RAMI
(1
Remove
optional
RAM
module
if
equipped.
(2)
Push the
ALL
RESET
button
on
the bottom.
(3)
Operate
DEFM
62 [EXE.
(4)
Write the following program.
10
FOR
I
=
1
TO
87
20
A
(I)
=
I
30
PRINT
A
(I)
40
NEXT
I
50
PRINT
"RAM OK"
60
END
(5)
After
writing the
above program, confirm
that the remaining
program
step
is
0.
(6)
Execute
the
program and confirm
the display counts up from
1
to
87 and shows
RAM
OK
by every depression of the
[eTxeTJ
key.
If
the above
operations
cannot be made,
RAM
1
may
be
faulty.
D.
RAM
2 (Optional
RAM
module)
(1)
Install
the
RAM
module
in
a
PC-4.
(2)
Push
the
ALL RESET
button on
the
bottom.
(3)
Operate
[MODE
1
1
and confirm that the remaining
program
step
is
1568.
If
the
display
shows
the remaining
step
as
544
.
(a)
RAM
2
is
not
functioning.
(b)
Wiring between
CPU
and
RAM
2 has
failed.
(4)
Operate
DEFM
190 |EXE| and
confirm
the display
***VAR:216.
(5)
Write the following program.
10
FOR
I
=
1
TO
215
20
A
(I)
=
I
30
PRINT A
(I)
40
NEXT
I
50
PRINT
"MODULE OK"
(6)
Execute
the
program and
confirm
the display counts
up from
1
to
215
and shows
MODULE OK
by
every depression of [EXEjkey.
If
the above program
is
not performed,
the
RAM
2
(optional
RAM
module)
may
be
at fault.
-
9
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