User manual

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If you are running the Windows 95/98 operating system, you can easily generate a list of the IRQ and I/O
Address assignments on your computer:
• Right click on the "My Computer" desktop icon.
• Click the "Properties" menu.
• Click on the "Device Manger" tab of the "Systems Properties" window.
• Double-click on the word "Computer."
This will show your computer's IRQ assignments. The table below shows the IRQ and I/O Address
assignment for a new laptop computer running the Windows 98 operating system. This computer has one
serial port (COM1) and one parallel port (LPT1).
TYPICAL LAPTOP/WINDOWS 98 CONFIGURATION
IRQ I/O Address Device
0
0040 – 0043
System Timer
1
0060 - 006F
Standard 101/102-Key or Microsoft Natural
Keyboard
2
Programmable interrupt controller
3
4
03F8 - 03FF
K56Flex HSP PNP Modem (COM1:)
5
0220 - 022F
0388 - 038B
Crystal PnP Audio System CODEC
6
03F0 - 03F7
Standard Floppy Disk Controller
7
0378 - 37F
Printer Port LPT1
8
System CMOS/real time clock
9
02F8 - 02FF
SHARP Fast Infrared Adapter
10
IRQ Holder for PCI Steering
11
Ricoh RL5C475 CardBus Controller
12
PS/2 Compatible Mouse Port
13
00F0 - 00FF
Numeric data processor
14
01F0 - 01F7
Intel 82371AB/EB PCI Bus Master IDE Controller
14
01F0 - 01F7
Primary IDE controller (dual fifo)
15
0170 – 0177
Intel 82371AB/EB PCI Bus Master IDE Controller
15
0170 - 0177
Secondary IDE controller (dual fifo)
Note that this computer has just one free interrupt request line, IRQ3. Note also that no IRQ is assigned to
the computer's second serial port, COM2:. If a PCMCIA-based card is installed, that card may be
assigned to IRQ3 by the Windows Plug-and-Play system.