[ The PC Guide | Systems and Components Reference Guide | Motherboard and System Devices | System Resources | System Configuration ]
Device Resource Usage Summary
The table below contains a summary line for each of the major device types in a typical PC, showing the major resources that they typically use. It is a summary table containing the information from the summary tables for IRQ, DMA channel and I/O address usage. You can use this as a handy quick reference when looking to add a new device to your PC, or to assist in debugging a resource problem. Circle or highlight the devices you currently have and the resources they are using, and then you'll be able to see at a glance what resources are still available or possible ways that you could shuffle assignments to fit in a new peripheral.
Note that the resources listed below are a guideline, and aren't the hard and fast rule for all devices; consult your manual to see the exact resources used by your hardware. The entries in bold represent the default resource usage in a typical PC; entries in regular text are optional resource allocations, or resources used by optional or non-standard devices:
Device Type |
Device |
IRQs |
DMA Channels |
I/O Addresses |
System |
System reserved |
0, 2, 8, 13 |
0, 4 |
000-0FFh (except 060h and 064h) and 100-12Fh and 20C-20Dh and 270-277h |
PCI devices |
9, 10, 11, 12 |
(depends on device) |
||
Serial Ports |
COM1 |
4 |
3F8-3FFh |
|
COM2 |
3 |
2F8-2FFh |
||
COM3 |
2/9, 4, 5, 7 |
3E8-3EFh |
||
COM4 |
2/9, 3, 5, 7 |
2E8-2EFh |
||
Parallel Ports |
LPT1 |
7 |
1, 3 (if ECP) |
378-37Fh, 3BC-3BFh |
LPT2 |
5, 7 |
1, 3 (if ECP) |
278-27Fh, 378-37Fh |
|
LPT3 |
5 |
1, 3 (if ECP) |
278-27Fh |
|
Input Devices |
Keyboard controller |
1 |
060h and 064h (shared with PS/2 mouse) |
|
PS/2 mouse |
12 |
060h and 064h (shared with keyboard) |
||
Joystick port |
200-207h |
|||
Storage |
Floppy disk controller |
6 |
2 |
3F0-3F7h |
Primary IDE controller |
14 |
1F0-1F7h and 3F6-3F7h |
||
Secondary IDE controller |
15, 10 |
170-177h and 376-377h |
||
Tertiary IDE controller |
11, 12 |
1E8-1EFh and 3EE-3EFh |
||
Quaternary IDE controller |
10, 11 |
168-16Fh and 36E-36Fh |
||
SCSI host adapter |
9, 10, 11, 12, 14, 15 |
1, 3, 5 |
130-14Fh, 140-15Fh, 220-23Fh, 330-34Fh, 340-35Fh |
|
Tape accelerator card |
3, 4, 5, 6, 7 |
1, 2, 3 |
360h, 370h, 3E0h, 3F0h |
|
Old PC/XT hard disk controller |
5 |
3 |
320-327h |
|
Video |
VGA video card |
11, 12 |
3B0-3BBh and 3C0-3DFh |
|
EGA video card |
2/9 |
3C0-3CFh |
||
Modems |
Modem |
2/9, 3, 4, 5, 7 |
1, 3 (voice modems) |
(uses COM port) |
Sound cards |
Sound card |
3, 4, 5, 7, 9, 10, 11, 12 |
(1, 3) and |
(220-22Fh, 240-24Fh, 260-26Fh, 280-28Fh) and (300-301h, 330-331h) and 388-38Bh |
Networking |
Non-NE2000 network card |
3, 4, 5, 7, 9, 10, 11, 12, 15 |
1, 3, 5, 6, 7 |
240-243h, 260-263h, 280-283h, 2A0-2A3h, 300-303h, 320-323h, 340-343h, 360-363h |
NE2000 network card |
3, 4, 5, 7, 9, 10, 11, 12, 15 |
1, 3, 5, 6, 7 |
240-25Fh, 260-27Fh, 280-29Fh, 2A0-2BFh, 300-31Fh, 320-33Fh, 340-35Fh, 360-37Fh |
Next: Resource
Conflicts and Conflict Resolution
| The PC Guide
(http://www.PCGuide.com) Site Version: 2.2.0 - Version Date: April 17, 2001 © Copyright 1997-2004 Charles M. Kozierok. All Rights Reserved. |
Not responsible for any loss resulting from the use of this site. Please read the Site Guide before using this material. |