Service Manual
IC18 SOUND CPU (68000)
IC MC68ECOOOFN12 PLCC MOTOROLA
Parts
No.:
315-0941
•Top
View
9
26
27
• Description
No.
I
1/0
Name
I
-
GND
2 D4
3
I
D3
4
l/0
D2
5
Dl
6
DO
..,
AS
I
8
0
UDS
9
LDS
10
RIW
61
60
44
43
Function
Data bus
Address strobe
Upper data strobe
Lower data strobe
Read/write
• Signal Description
PROCESSOR{
STATUS
SYSTEM{
CONTROL
vee
GND
CLK
FCO
FC1
FC2
BERR
RESET
HALT
No.
35
36
37
38
39
40
r--;n
42
43
44
MC68ECOOO
1/0
Name
-
GND
A4
AS
A6
A7
A8
A9
AlO
All
0
Al2
II
I
DTACK
Data transfer acknowledge 45
Al3
12
0
BG
Bus grant
46 A14
13
I
BR
Bus request 47
Al5
I4
vee
Power
-
IS
48
Al6
49
A17
16
I CLK Clock
50
Al8
17
GND
Ground
-
18
51
Al9
52 A20
19
I
MODE
8 bit/16 bit select
53
-
vee
20
1/0
HALT
Halt
54
A21
21
l/0
RESET
Reset
55
0 A22
22
- NC
Not connected
56
A23
23
I
AVEC
57
-
GND
24
I
BERR
Bus error
58
DIS
25
IPL2
59 D14
26
I
IPLI
Interrupt control
60
Dl3
27
IPLO
61
D12
28
FC2
62
Dll
29
0
FCI
Processor status
63
I/0
DIO
30
FCO
64 D9
31
AO
65 D8
32
0
AI
Address bus
33
A2
66
D7
67 D6
34
A3
68 D5
-55-
ADDRES!iBU
s
3-Al
)A2
DATA BUS
01
AS
Rfii
uos
>
Ios
DTACK
BR
}
BG
IPLO
iPTI
IPL2
>
AVEC
J
Ground
5-00
ASYNCHRONOUS
BUS CONTROL
BUS
ARBITRATION
CONTROL
INTERRUPT
CONTROL
Function
Address bus
Power
Address bus
Ground
Data bus