POKEY
(PORT)
TEST
m
Purpose: To determine any port line failures and confirm the correct
operation of the POKEY chip.
Procedure: Press
key
5
followed
by
START.
Format:
When
you press the keys listed in the
numbers and letters in the second column should
the
KB
column:
KEY
KBReadings
-
1 1
2
2
3
3
NOTE: When using
first column below, the
appear on the screen in
the 1.1 Diagnostic
4
5
6
7
8
9
#
0
*
START
PAUSE
RESET
Cartridge to
test
the 2-PORT 5200, the
KB
Readings may appear to the right
of
any of the four ports listed on the screen,
besides the port you are testing. They
must, however, appear to the right
of
the
-
port you
are
testing for
the
test
to be
valid.
If the keys do not register correctly when pressed, proceed to
KEYBOARD
TROUBLESHOOTING, page 4A-22.
Press the bottom fire button. The
POKEY
ADJUST screen should disappear.
If
it
doesn't proceed to page
3A-9.
Press key
5
followed
by
START,
again bringing the
POKEY
ADJUST pattern
to the screen. Unplug the controller from Port
1
and
insert it- into Port
2.
Repeat Step 2.
RAM
TEST
Initialization
for
RAM
Test
Purpose: To
set
the
5200
up for
a
loop
test
to fully
check
the RAM
(A1
8-
A25).
Procedure: Press key
9
followed
by
START.
Then press key
2
followed by START.
Again press key
2
followed
by
START.
DISPLAY
ERRORS
CONTINUOUS TEST appears in the green band on the
screen.
RAM
Test
Procedure
Purpose: To
test
the functioning of the 16K RAM chips.
Procedure: Press key
7
followed
by
START.
CX5200
Field Service Manual
3A-8
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