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°Scroll inside the window
CRT, advance
CRT, reverse
°Scroll can be attained by a change in VMA.
°Scrolling stops when it r
e
ach
e
s the end (one window in use).
VRAM
CRT
ABC
E
J:.
H
er
I
]"
K
L
/' w f N
0
P
Q
R S
T
U V
·
w
X
Y'Z
1
.2
D
4-
W1
E
F
er
H
I
.J k
L
M N
0
P
~WO
Q
R.ST
U
V\VX
y
Z
1
2
Or a single line revision
*When two windows are used in apart of the screen, it permits scrolling
"
from
the
bot tom
end
to
the
top
end
of
the
VRAM
J
whi.ch
looks
as
if
scrolling
within one window.
In such an
occaslon,
the following screen
\
setup
and seraIl may be possible.
(i) Two windows scrolling in different directions.
(ii) One window scrolling and two windows not scrolling.
VRAM
CRT
5A02
---7
SAI)l
~
a
b
c
cl
e-
f
3
h
,
j
k
I
lY1
n
J\
B
c.
D
2 J: q
~
i
j
k
L
M
N
0
P
(). R
~-r
tJ
V
w"X
Y Z
1
2
I
2
J
~
) .....
h
7
A A A
B 8
B
c..
C
c..
D D D
E
E
E
!= F F
q 4"
q
EFq
H
c
cl
B ß 8
2
1
J
K L
e
f
ce
C
.?
MN
0
P
g
h
DDD
<J.
URST
i
j
E8E
s
U
V
}v'
X
k 1
F
F=
F
b
'(
Z
7 2
Mn
4ClCf
?
'A
B
c
D
(.\ b
A
A A.
1
-},Whe
n
the
displ
ay
is
divided vertically as shown
above,
each
window
can be
serolied in the
same direction at the same time by
changing
SADl
and
2
,
without
changing
VMA.
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