22 Serial-Ring Indicator 121 System Address Bit 11
23 Serial Transmit Data 122 System Address Bit 12
24 Serial Clear-to-Send 123 System Address Bit 13
25 Ground 124 Ground
26 Serial Receive Data 125 System Address Bit 14
27 Serial Ready-to-Send 126 System Address Bit 15
28 Serial Carrier Detect 127 System Address Bit 16
29 Serial-Data Set Ready 128 Ground
30 Ground 129 System Address Bit 17
31 DMA Acknowledge 2 * 130 System Address Bit 18
32 DMA Acknowledge 1 * 131 System Address Bit 19
33 DMA Acknowledge 0 * 132 Ground
34 +5V Fused (computer) 133 Printer Select In *
35 Printer Paper Out 134 Diskette Boot
36 Printer Acknowledge * 135 Diskette Low Den. Media *
37 Printer Data Bit 6 * 136 Diskette Direction In *
38 Printer Data Bit 4 137 Ground
39 Ground 138 Diskette Index *
40 Printer Data Bit 2 139 Diskette Change *
41 Printer Data Bit 0 140 Diskette Head Select
42 Keypad Data 141 Ground
43 Battery Voltage 142 Reserved
44 Keyboard Clock 143 No Wait States *
45 Keyboard Data 144 Bus Ready
46 Mouse Clock 145 Ground
47 Battery Voltage 146 I/O Read Control *
48 Ground-CRT 147 I/O Write Control *
49 Ground-CRT 148 ISA Bus Clock
50 Ground-CRT 149 Ground
51 Ground-CRT 150 Address Latch Enable
52 Ground-CRT 151 DMA Cycle Indicator
53 DMA Request 1 152 Unlatched Address Bit 17
54 DMA Request 7 153 Ground
55 DMA Request 6 154 Unlatched Address Bit 18
56 Ground 155 Unlatched Address Bit 19
57 DMA Request 5 156 Unlatched Address Bit 20
58 DMA Request 3 157 Unlatched Address Bit 21
59 DMA Request 2 158 Ground
60 Ground 159 Unlatched Address Bit 22
61 DMA Request 0 160 Unlatched Address Bit 23
62 DMA Acknowledge 7 * 161 System Address Bit 0
63 DMA Acknowledge 6 * 162 Ground
64 Ground 163 System Address Bit 1
65 DMA Acknowledge 5 * 164 System Address Bit 2
66 DMA Acknowledge 3 * 165 System Address Bit 3
67 Spare 166 Diskette Drive Select *
68 Reserved 167 Diskette Low Density *
69 Ground 168 High Density
70 Reserved 169 External Diskette Connected *
71 Diskette Write Protect * 170 Tape Select *
72 Diskette Write Data * 171 Ground
73 Ground 172 Diskette Motor *
74 Diskette Step * 173 16-Bit I/O Cycle *
75 Diskette Track 0 * 174 Low Memory *
76 Reset 175 Ground
77 Ground 176 Memory Read Control *
78 System Data Bit 15 177 Memory Write Control *
79 System Data Bit 14 178 16-Bit Memory Cycle *
80 System Data Bit 13 179 Ground
81 Ground 180 Bus Master Grab *
To Next Page
Loading...
Need help?
General