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1)
Memory
test
Sub-IOCS
RAM
(4000H-5FFF)
Shared
RAM
(2003H-23FFH)
Shared
RAM
(2440H-27FFH)
Above
are
tested.
[Display]
(1)
Normal test ending
RA
OK:
SUB-IOCS
RAM
RA
OK
RA
OK
Above
information
are
displayed
on
three display
lines.
(2)
Abnormal
test
ending
RA ER
Shared
RAM
2)
VRAM
check
Proceed
to
test
for
ASCI!
and
atnbute
VRAM
[Display]
During
test penode, display
shows
under following.
(1)
Display
reviced
"U" for
entire
screen
Irom
top
side.
(2)
Display blinking
"I''
with under!
ne for
entire
screen.
(3)
Display entire
screen
by
space.
Test
end
1.
Normal
VR OK
2.
Abnormal
VR ER
3)
CRT
inter
face test
Performance
of the CRT is
tested.
To
move
into
each
test
phase,
push
the
HALT
switch.
Test
No.1-No.8
test
the
400-raster CRT,
and
test
No.9-No.16
test
the 200
rasters
CRT.
'Procedure
and
display]
(TestNo.1)
Confirm
all
patterns
on the
display screen
of 40
digits
and
20
lines.
20
1
234567890
2
3
4
5
i
(All
patterns)
I
I
5
6
7
8
9
0
C
*7 '
O
/ I
ASCII
00-FF
(Test
No.2)
Confirm
all
patterns
on the
display
screen
of 80
digits
and
25
lines.
25
1234567890-
2
3
4
5
-567890
(All
patterns)
(Test
No.3)
(1)
Confirm
that
an
entire
screen
is
Filled
with
"H".
(2)
Confirm
that
attributes
are
shown
as
illustrated.
Vertical line
Horizontal line
Highlight
Blink
-
97
-