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Computer Information:
« Interrupt Requests | Base I/O Port Settings | Hexadecimal | ASCII Character Set »
IRQ
2 EGA/VGA Video
3 Second serial port [COM2, COM4] or bus mouse Network Interface Card
4 COM1, COM3
5 Second parallel port [LPT2], sound card or NIC
6 Floppy-disk controller
7 Parallel port (LPT1)
8 Real-time clock
9 EGA/VGA Video
10 Available
11 Available
12 Mouse (PS/2)
13 Math coprocessor
14 Hard-disk controller
15 Available (unless used for secondary hard-disk controller)
Base I/O Port Setting
Port Device Port Device
200 to 20F Game port 300 to 30F NIC 210 to 21F 310 to 31F NIC 220 to 22F 320 to 32 F Hard-disk controller (for PS/2 Model 30) 230 to 23F Bus mouse
200 to 20F Game port 300 to 30F NIC
210 to 21F 310 to 31F NIC
220 to 22F 320 to 32F Hard-disk controller (for PS/2 Model 30)
230 to 23F Bus mouse 330 to 33F
240 to 24F 340 to 34F
250 to 25F 350 to 35F
260 to 26F 360 to 36F
270 to 27F LPT3 370 to 37F LPT2
280 to 28F 380 to 38F
290 to 29F 390 to 39F
2A0 to 2AF 3A0 to 3AF
2B0 to 2BF 3B0 to 3BF LPT1
2C0 to 2CF 3C0 to 3CF EGA/VGA
2D0 to 2DF 3D0 to 3DF CGA/MCGA (also EGA/VGA, in color video modes)
2E0 to 2EF 3E0 to 3EF
2F0 to 2FF COM2 3F0 to 3FF Floppy-disk controller; COM1
Hexadecimal
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
HEX
DEC
ASCII
Description
Keyboard
0
0
NUL
Null ctrl @
1 1 SOH Start heading
ctrl A
2
2
STX
Start text
ctrl B
3
3
ETX
End text
ctrl C
4
4
EOT
End transmission
ctrl D
5
5
ENQ
Enquire
ctrl E
6
6
ACK
Acknowledge
ctrl F
7
7
BEL
Bell
ctrl G
8
8
BS
Backspace
ctrl H/special key
9
9
HT
Horizontal tab
ctrl I/special key
10
10
LF
Line feed
ctrl J
A
11
VT
Vertical tab
ctrl K
B 12 FF
Form feed
ctrl L C 13 CR
Carriage return ctrl M/special key D 14 SO Shift out ctrl N E 15 Sl Shift in ctrl O 10 16 DLE Data link escape ctrl P 11 17 DC1 Device control 1 ctrl Q also XON 12 13 DC2 Device control 2 ctrl R 13 19 DC3 Device control 3 ctrl S also XOF 14 20 DC4 Device control 4 ctrl T 15 21 NAK Negative acknowledge ctrl U 16 22 SYN Synchronous Idle ctrl V 17 23 ETB End trans. block ctrl W 18 24 CAN Cancel ctrl X 19 25 EM End medium ctrl Y 1A 26 SS Special sequence ctrl Z spare 1B 27 ESC Escape Esc 1C 28 FS File separator 1D 29 GS Group separator 1E 30 RS Record separator 1F 31 US Unit separator 20 32 SP Space Space 21 33 ! 22 34 " 23 35 # 24 36 $ 25 37 % 26 38 & 27 39 ' Apostrophe 28 40 ( 29 41 ) 2A 42 * 2B 43 + 2C 44 , 2D 45 - 2E 46 . 2F 47 / 30 48 0 31 49 1 32 50 2 33 51 3 34 52 4 35 53 5 36 54 6 37 55 7 38 56 8 39 57 9 3A 58 : Colon 3B 59 ; Semicolon 3C 60 < 3D 61 3E 62 > 3F 63 ? 40 64 @ 41 65 A 42 66 B 43 67 C 44 68 D 45 69 E 46 70 F 47 71 G 48 72 H 49 73 I 4A 74 J 4B 75 K 4C 76 L 4D 77 M 4E 78 N 4F 79 O 50 80 P 51 81 Q 52 82 R 53 83 S 54 84 T 55 85 U 57 86 V 58 87 W 59 88 X 5A 90 Z 5B 91 [ 5C 92 \ Backslash 5D 93 1 5E 94 ^ Circumflex 5F 95 _ Underscore 60 96 ` Grave accent 61 97 a 62 98 b 63 99 c 64 100 d 65 101 e 66 102 f 67 103 g 68 104 h 69 105 i 6A 106 j 6B 107 k 6C 108 l 6D 109 m 6E 110 n 6F 111 o 70 112 p 71 113 q 72 114 r 73 115 s 74 116 t 75 117 u 76 118 v 77 119 w 78 120 x 79 121 y 7A 122 z 7B 123 { 7C 124 | 7D 125 } 7E 126 ~ Tilde 7F 127 DEL Delete
« Interrupt Requests | Base I/O Port Settings | Hexadecimal | ASCII Character Set »
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