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TITLE: I/O and IRQ Conflicts
DOCUMENT ID#: FYI.P.6054
DATE: 04Dec92
PRODUCT: NetWare Lite
PRODUCT VERSION: All versions
SUPERSEDES: 6012 and 6013
SYMPTOM: NA
ISSUE/PROBLEM
Resolving I/O and IRQ Conflicts
I/O Conflicts
The ethernet, arcnet or other network card (NIC) will need to use an unique I/O address. The following table shows some possible conflicts. Column one shows the range from 200 to 3E0 (hex). Column two shows some possible conflicting devices. Select an I/O address that best fits your configuration, however, be aware that this table is generic. If problems persist consult the documentation of your specific system. It is also possible to get a listing of your I/O addresses with a computer utility program.
I/O address Potential Conflicting devices
200 Game controller /Joystick (200-20F)
220 Novell Network Keycard
240
260 LPT2: (278-27F)
280 LCD display on Wyse 2108 PC
2A0
2C0
2E0 COM4:, GPIB-Adapter 0 (2E1)
COM2:, Data acquisition (300-31F)
300
320 XT Hard Disk interface (320-32F)
340
360 LPT1: (378-37F)
380 SLDC/Sec Bi-Sync interface (380
3A0 Primary Bi-Sync interface (3A0-3A9)
Monochrome display (3B0-3BB)
3C0 EGA display control (3C0-3CF)
CGA display control (3D0-3CF)
3E0 COM3: (3E8-3EF)
Floppy disk controller (3F0-3F7)
COM1: (3F8-3FF)
IRQ Conflicts
A unique interrupt level (IRQ) must be assigned to your network interface card (NIC). Each manufacturer's NIC card is unique in the available interrupts it offers (refer to the network card's manual to determine its interrupt options). The following table may help in selecting an interrupt option that is not currently being used in your system. It is also possible to get a specific reading of your interrupts from a computer utility program.
IRQ XT AT (286,386,486)
0 TIMER OUTPUT 0
1 KEYBOARD
2 EGA/VGA EGA/VGA
3 COM2 COM2
4 COM1 COM1
5 HARD DISK LPT2
6 FLOPPY DISK
7 LPT1 LPT1
8 REAL TIME CLOCK
9
10
11
12
13 COPROCESSOR
14 HARD DISK
15
NOTE: For best results you should try and use a free IRQ. If the chart shows that you are using all possible interrupts, it is possible that your enthernet or other NIC card may use an interrupt that is already being used. ie ... many programs do not address LPT1 on the interrupt level, hence if you have no free interrupts it is possible to assign two functions to the same interrupt.