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Sharp MZ-800 Service Manual page 15

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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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