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[STEP
5]
V
RAM
TEST
•
The
V-RAM
test
is
executed without
dividing
the
V-RAM
address
0000H
thru
3FFFH 16K
byte
area.
•
Since the
display
changes during the
test,
the
OK/NG
display
is
not
shown
unitl after
the
check has been completed.
•
If
a
NG
output
is
obtained
at
the
55H
stage
of
the
test,
the
program proceeds immediately
to
the
ROM
TEST.
To
ROM
TEST
F
ig.
1 1
-
1
7
V-R
AM
test
flow chart
[STEP
6]
Rom
Test
• The
ROM
TEST
is
divided
into
the
P-BASIC
ROM
TEST
and
the
MSX-BASIC
ROM
TEST
©
.
1.
Check
to see that
P-BASIC
ROM
address
4000,
4001,
4010
thru
4012H
data
is
as
shown
in
the
following
table.
Table
P-BASIC
ROM
address data
2.
All
P-BASIC
ROM
address data
from
4000H
to
5FFFH
is
summed
(addition
of
all
bytes with
no
carry),
and
a
check
is
made
to see that the
sum
is
FFH.
To MSX-BASIC TEST
63
Fig.
11-18
ROM
test
flow-chart
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