No#
|
Hex Address
|
Assignment (AT)
|
|
|
|
2 [0A]
|
28 - 2B
|
Cascade input for 2nd interrupt controller; VGA Cards
cascade [9]
|
|
|
Tied to
IRQs 8 -15, assigned for older EGA cards
|
|
|
|
3 [0B]
|
2C - 2F
|
Com 2 : Serial 2; Bus Mouse; PC Network; SDLC/BSC; Faxcard/Modem
|
|
|
Also Com 4
where Com 2 is not used
|
|
|
|
4 [0C]
|
30 - 33
|
Com 1 : Serial 1; SDLC/BSC
|
|
|
Also Com 3
where Com 1 is not used
|
|
|
|
5 [0D]
|
34 - 37
|
LPT 2 : Bus Mouse; Sound Blaster/Emulation; Scanners
|
|
|
HD
Controller on old XT
|
|
|
|
6 [0E]
|
38 - 3B
|
Floppy Disk Control
|
|
|
.
|
|
|
|
7 [0F]
|
3C - 3F
|
LPT 1 : Printer; Sound Blaster/Emulation
|
|
|
.
|
|
|
|
10
|
40 - 43
|
Bios : Video; SCSI; Sound Blaster/Emulation;
Various
|
|
|
N/A on PC /
XT
|
|
|
|
11
|
44 - 47
|
Bios : Equipment Check; SCSI; Sound
Blaster/Emulation; Various
|
|
|
N/A on PC /
XT
|
|
|
|
12
|
48 - 4B
|
Bios : Memory; Various
|
|
|
N/A on PC /
XT
|
|
|
|
13
|
4C - 4F
|
Bios : Diskette; Disk
|
|
|
N/A on PC /
XT
|
|
|
|
14
|
50 - 53
|
Bios : Serial Coms; Hard Disk (Primary); SCSI
|
|
|
N/A on PC /
XT
|
|
|
|
15
|
54 - 57
|
Bios : Cassette System; Hard Disk (Pentium
Secondary); SCSI
|
|
|
N/A on PC /
XT
|
|
|
|
16
|
58 - 5B
|
Bios : Keyboard
|
|
|
N/A on PC /
XT
|
|
|
|
17
|
5C - 5F
|
Bios : LPT Parallel
|
|
|
N/A on PC /
XT
|
|
|
|
18
|
60 - 63
|
Bios : Resident Basic
|
|
|
N/A on PC /
XT
|
|
|
|
19
|
64 - 67
|
Bios : Bootstrap Loader
|
|
|
N/A on PC /
XT
|
& Hosted