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Commodore 128D User Manual Page 12

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U7
M8722
MMU
IC5
M8722
MMU
IC9
74F32
U9
74F32
U20
4066
IC8
4066
IC7
74F00
IC6
’138
U3
’138
6
3
TA15
4
TA14
5
TA13
6
TA12
7
TA11
8
TA10
9
TA9
10
TA8
11
CAS1
12
CAS0
13
MS2
14
MS1
15
MS0
34
V
SS
48
40/80
47
MS3
46
EXROM
45
GAME
44
FSDIR
43
Z80EN
42
D7
41
D6
40
D5
39
D4
38
D3
37
D2
36
D1
35
D0
33
Φ
IN
32
R/W
31
A15
30
A14
29
A13
28
A12
27
A11
26
A10
25
A9
24
A8
23
A7/A6
22
A5/A4
21
A3
20
A2
19
A1
18
A0
17
MUX
16
AEC
2
RESET
1
V
DD
6
3
TA15
4
TA14
5
TA13
6
TA12
7
TA11
8
TA10
9
TA9
10
TA8
11
CAS1
12
CAS0
13
MS2
14
MS1
15
MS0
34
V
SS
48
40/80
47
MS3
46
EXROM
45
GAME
44
FSDIR
43
Z80EN
42
D7
41
D6
40
D5
39
D4
38
D3
37
D2
36
D1
35
D0
33
Φ
IN
32
R/W
31
A15
30
A14
29
A13
28
A12
27
A11
26
A10
25
A9
24
A8
23
A7/A6
22
A5/A4
21
A3
20
A2
19
A1
18
A0
17
MUX
16
AEC
2
RESET
1
V
DD
6
1
A1
4
A2
10
A3
13
A4
3
C1
6
C2
7
V
SS
8
C3
9
B3
5
B2
11
C4
12
B4
2
B1
14
V
DD
6
2
B1
12
B4
11
C4
5
B2
9
B3
8
C3
7
V
SS
6
C2
3
C1
13
A4
10
A3
4
A2
1
A1
14
V
DD
6
13
E
1
5
E
2
6
E
3
12
E
4
1
A
1
4
A
2
8
A
3
11
A
4
2
B
1
3
B
2
9
B
3
10
B
4
7
V
SS
14
V
DD
6
13
E
1
5
E
2
6
E
3
12
E
4
1
A
1
4
A
2
8
A
3
11
A
4
2
B
1
3
B
2
9
B
3
10
B
4
7
V
SS
14
V
DD
6
14
7
a
a
®
®
2
1
3
12
13
11
a
a
®
®
5
4
6
10
9
8
6
1
A
2
B
3
C
15
Y0
14
Y1
13
Y2
12
Y3
11
Y4
10
Y5
8
V
SS
9
Y6
7
Y7
6
G1
5
G2
4
G3
16
V
DD
6
1
A
2
B
3
C
15
Y0
14
Y1
13
Y2
12
Y3
11
Y4
10
Y5
8
V
SS
9
Y6
7
Y7
6
G1
5
G2
4
G3
16
V
DD
68 Ω
68 Ω
R3
R4
`
`
`
`
`
`
RAMCAS2
RAMCAS3
`
`
`
A0
A1
A2
A3
`
`
Figure 6: The schematics diagram for the MMU expansion logic.
12
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