Atari 800

As
was the
case
with
the
PORT
Test,
failures appear as Red
Is
in this display. If
the
pattern
is in a
state
of constant
change, one of the RAM
boards
probably has
a set of
defective 7*LS158
chips. If
you replace
the
chips make
certain
that the new
chips
have the
same manufacturer
and the same
date code.
This
ensures
compatibility. To
determine
which board(s)
is(are} defective, perform the following
three steps:
1)
Turn
off the power,
2)
Remove
one of the boards.
3)
Start
the test from Display Options,
page
3-10.
If
the
pattern is stable, look
at line B, Columns *
thru 7
to determine which
board is
defective, (See Table 3-2).
D
E
4
0100
0001
0000
0000
RAM
0000
1000
0000
TEST
TESTING
40
K
0004-
0004
ERROR
COUNTER
TEST
COUNTER
Figure
3-S, RAM
Test
Screen
ATARI
Home
Computer
3-13