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5.3.7
Expansion bus connector (in the system unit)
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
TABLE 5-7 Expansion Bus Connector (A side/B side)
Signal Names
SIGNAL
1/0
DESCRIPTION
PIN
SIGNAL
I/O
DESCRIPTION
GND
GROUND (OV)
31
A191
0
UPPER 4-BIT ADDRESS
VCC
+5VDC
32
SYDOl
1/0
BIDIRECTIONAL 8-BIT
DATA BUS
MVEE
-9VDC
33
SYD11
1/0
BIDIRECTIONAL 8-BIT
DATA BUS
PVDD
+ 12VDC
34
SYD21
1/0
BIDIRECTIONAL 8-BIT
DATA BUS
MDSLO
0
BUILT IN MODEM SELECT
35
SYD31
1/0
BIDIRECTIONAL 8-BIT
DATA BUS
CMCKl
0
COMMUNICATION
36
GND
GROUND (OV)
CLOCK/REFRESH
MIRQO
I
MODEM INTERRUPT
37
SYD41
I/O
BIDIRECTIONAL 8-BIT
REQUEST
DATA BUS
SPTONO
I
SPEAKER DRIVE SIGNAL
38
SYD51
I/O
BIDIRECTIONAL 8-BIT
DATA BUS
GND
GROUND (OV)
39
SYD61
I/O
BIDIRECTIONAL 8-BIT
DATA BUS
AOBBl
0
ADDRESS 0 FOR BYTE BUS
40
SYD71
I/O
BIDIRECTIONAL 8-BIT
DATA BUS
A011
0
LOWER 16-BIT ADDRESS
41
MEWRO
0
MEMORY WRITE
COMMAND
A021
0
LOWER 16-BIT ADDRESS
42
XMERDO
0
MEMORY READ
COMMAND
A031
0
LOWER 16-BIT ADDRESS
43
GND
GROUND (OV)
A041
0
LOWER 16-BIT ADDRESS
44
XIOWRO
0
I/O WRITE COMMAND
A051
0
LOWER 16-BIT ADDRESS
45
XIORDO
0
I/O READ COMMAND
A061
0
LOWER 16-BIT ADDRESS
46
TCl
0
TERMINAL COUNT
A071
0
LOWER 16-BIT ADDRESS
47
CALEl
0
CPU ADDRESS LATCH
ENABLE
GND
GROUND (OV)
48
RESETl
0
RESET HIGH-ACTIVE
OUTPUT
A081
0
LOWER 16-BIT ADDRESS
49
DACK10
0
DMA ACKNOWLEDGE
SIGNAL
A091
0
LOWER 16-BIT ADDRESS
50
IRQ21
I
INTERRUPT REQUEST
A10l
0
LOWER l6-BIT ADDRESS
51
GND
GROUND (OV)
Al11
0
LOWER 16-BIT ADDRESS
52
VCC
+5VDC
A 121
0
LOWER 16-BIT ADDRESS
53
CPCKBl
0
CPU CLOCK
A131
0
LOWER 16-BIT ADDRESS
54
IRQ51
I
INTERRUPT REQUEST
A141
0
LOWER 16-BIT ADDRESS
55
DRQ31
I
DMAREQUEST
A151
0
LOWER 16-BIT ADDRESS
56
DACK30
0
DMA ACKNOWLEDGE
SIGNAL
GND
GROUND (OV)
57
CPADEO
0
CPU ADDRESS ENABLE
A161
0
UPPER 4-BIT ADDRESS
58
DRQll
I
DMAREQUEST
A171
0
UPPER 4-BIT ADDRESS
59
10RDYl
I
I/O CHANNEL READY
A181
0
UPPER 4-BIT ADDRESS
60
GND
GROUND (OV)
5-12
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