Measurement Computing CIO-DAS16 User Manual
Page 31
The two groups of ports, group A and group B, may be independently programmed in one of several modes. The most
commonly used mode is mode 0, input / output mode. The codes for programming the 82C55 in this mode are shown in
Table 4-4. D7 is always 1 and D6, D5 & D2 are always 0.
Table 4- 4. Programming Codes for 82C55 in Mode 0, Input/Output Mode
IN
IN
IN
IN
155
9B
1
1
1
1
OUT
IN
IN
IN
154
9A
0
1
1
1
IN
OUT
IN
IN
153
99
1
0
1
1
OUT
OUT
IN
IN
152
98
0
0
1
1
IN
IN
OUT
IN
147
93
1
1
0
1
OUT
IN
OUT
IN
146
92
0
1
0
1
IN
OUT
OUT
IN
145
91
1
0
0
1
OUT
OUT
OUT
IN
144
90
0
0
0
1
IN
IN
IN
OUT
139
8B
1
1
1
0
OUT
IN
IN
OUT
138
8A
0
1
1
0
IN
OUT
IN
OUT
137
89
1
0
1
0
OUT
OUT
IN
OUT
136
88
0
0
1
0
IN
IN
OUT
OUT
131
83
1
1
0
0
OUT
IN
OUT
OUT
130
82
0
1
0
0
IN
OUT
OUT
OUT
129
81
1
0
0
0
OUT
OUT
OUT
OUT
128
80
0
0
0
0
CL
B
CH
A
DEC
HEX
D0
D1
D3
D4
27
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