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Sharp MZ-800 - Page 15

Sharp MZ-800
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Scroll and and
control
circuit
hardware
• Block diagram
Start address
SEA-SOF
10
DA(MA)
10
7 SEA
DA(MA)
7
Scroll
width
SOF
c
Scroll offset
Relation
of
display address. SEA. SSA. vs
SOF
Display address
m
I k
j i
SSA
SSA SSA
SSA SSA SSA
6
5
4 3 2
SEA
SEA
SEA SEA SEA
SEA
6
5
4 3
2
SOF
SOF SOF
SOF
SOF SOF
9
8
7
6
5
Screen left end address
o Line 0
0 0
0 0
1 Line
0
0 0 0 0
2 Line
0
0 0 0
0
3 Line
0
0 0 0 0
8 Line
0 0 0
0
1
16 Line
0 0
0 0
24 Line
0 0 0
1
192 Line
0
199 Line
Relation
of
SW vs
SOF
SW>
SOF
h
SSA
1
SEA
1
SOF
4
0
0
0
0
0
1
1
0
0
14
MZ-800
Scroll
control
register
SSA: Scroll start address
Increment
of
SSA: $5
Minimum
value
of
SSA:
$0
Maximum
value
of
SSA:
$78
MSB
LSB
N
6
5
4 3 2
SEA: Scroll end address
Increment
of
SEA: $5
Minimum
value
of
SEA:
$5
Maximum
value
of
SEA:
$70
MSB
LSB
N
6
5
4 3
2
SW:
Scroll
width
Increment
of
SW:
$5
Minimum
value
of
SW:
$5
Maximum
value
of
SW:
$70
Relation
of
SW. SEA. vs SSA
SW
= SEA - SSA
SW>
SSA
MSB
LSB
N
6
5 4 3
2
S~
I
SOF: Scroll offset
Increment
of
SOF:
$5
Minimum
value
of
SOF:
$0
(without
offset)
Maximum
value
of
SOF: $3E8
MSB
LSB
SOF
1 I
7
6 5
4
3
2
S~F
I
MSB
LSB
SOF
21
__________
1
9
S~F
1
S~A
I
f e d
I
c
b a
-
-
0
SEA I
I
S~F
IS~F
S~F
I
-
SOF
3 2
I
I
I
0
0 0 0 0 0
0
0
1 0
0 0 0
First line
1 0 0 0
0 0
1 1 0 0
0
1
0 0
0 0 0 0
Second line
0
0 0 0 0 0 0
Second line
1
0 0
0
0
0 0
0 0 0 0
0
0
0
Twenty
fifth line
0
0 0 0 0

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