B. Specifications
130
J6 Local Bus Pinout (continued)
Pin#
Signal
Type
Description
Pin#
Signal
Type
Description
24
A19
Out
CPU Address
74
GND
------
Ground
25
A22
Out
CPU Address
75
/BE1
Out
Byte Enable
26
A21
Out
CPU Address
76
/SLCT
In
Module Select
27
A24
Out
CPU Address
77
/BE2
Out
Byte Enable
28
A23
Out
CPU Address
78
/PRES
In
Module Present
29
VCC
------
+5 Volts
79
/BE3
Out
Byte Enable
30
A25
Out
CPU Address
80
/RDY
In
Ready
31
A26
Out
CPU Address
81
GND
------
Ground
32
A27
Out
CPU Address
82
/BRDY
In
Burst Ready
33
A28
Out
CPU Address
83
ADS
Out
Address Status
34
A29
Out
CPU Address
84
/BLAST
Out
Burst Last
35
A30
Out
CPU Address
85
M/I
Out
Memory/I/O
36
A31
Out
CPU Address
86
/LBA
In
Local Bus Ack.
37
D00
In/Out
CPU Data
87
W/R
Out
Write/Read
38
GND
------
Ground
88
/KEN
Out
Cache Enable
39
D02
In/Out
CPU Data
89
D/C
Out
Data/Control
40
D01
In/Out
CPU Data
90
/VIDEN
Out
Video Enable
41
D04
In/Out
CPU Data
91
RESET
Out
CPU Reset
42
D03
In/Out
CPU Data
92
KBD
Out
Keyboard Data
43
D06
In/Out
CPU Data
93
RSVD
------
Reserved
44
D05
In/Out
CPU Data
94
KBC
Out
Keyboard
Clock
45
D08
In/Out
CPU Data
95
GND
------
Ground
46
D07
In/Out
CPU Data
96
GND
------
Ground
47
GND
------
Ground
97
CLK14
Out
14.318 MHz
Clock
48
D09
In/Out
CPU Data
98
CLK
Out
CPU Clock
49
D10
In/Out
CPU Data
99
VCC
------
+5 Volts
50
D11
In/Out
CPU Data
100
VCC
------
+5 Volts
