Table 3. IRQ Line Assignments
Memory Allocations
Table 4
provides a map of the conventional memory area. When the microprocessor or a program addresses a location within the conventional
memory range, it is physically addressing a location in main memory.
Table 4. Conventional Memory Map
Table 5
provides a map of the upper memory area. Some of these addresses are dedicated to various system devices, such as the system/video
basic input/output system (BIOS). Others are available for use by expansion cards and/or an expanded memory manager (EMM).
When the microprocessor or a program addresses a location within the upper memory area, it is physically addressing a location within one of
these devices.
Table 5. Upper Memory Map
NOTES: Installed devices cannot share the same COM port address. The default address of your computer's serial port is COM1.
To view IRQ line assignments in the Microsoft
®
Windows
®
95 and Windows 98 operating systems, click the
Start
button, point to
Settings
, and click
Control Panel
. Double-click the
System
icon. Select the
Device Manager
tab, and then double-click
Computer
.
IRQ Line Reserved/Available
IRQ0
Reserved; generated by the system timer
IRQ1
Reserved; generated by the keyboard controller to signal that the keyboard output buffer is full
IRQ2
Reserved; generated internally by the interrupt controller to enable IRQ8 through IRQ15
IRQ3
Available for use by a PC Card unless the integrated serial port or infrared port is configured for COM2 or COM4
IRQ4
Available for use by a PC Card unless the integrated serial port or infrared port is configured for COM1 (the default) or COM3
IRQ5
Available for use by the audio controller
IRQ6
Generated by the diskette drive controller to indicate that the diskette drive requires the attention of the microprocessor
IRQ7
Available for use by a PC Card or audio controller if the parallel port is disabled
IRQ8
Reserved; generated by the system I/O controller's RTC
IRQ9
Reserved
IRQ10
Available for use by a PC Card or audio controller unless the C/Port Family APR or C/Dock Family Expansion Station is attached
IRQ11
Available for use by USB, PC Card, video controller, and audio controller
IRQ12
Reserved; generated by the keyboard controller to indicate that the output buffer of the touch pad or external PS/2 mouse is full
IRQ13
Reserved; generated by the math coprocessor
IRQ14
Reserved; generated by the hard-disk drive to indicate that the drive requires the attention of the microprocessor
IRQ15
Reserved; generated by CD-ROM drive in the external media bay to indicate that the drive requires the attention of the
microprocessor
NOTE: To view memory allocations in Windows 95 and Windows 98, click the
Start
button, point to
Settings
, and click
Control Panel
.
Double-click the
System
icon. Click the
Device Manager
tab, and then double-click
Computer
.
Address Range
Use
0000h-003FFh
Interrupt vector table
00400h-004FFh
BIOS data area
00500h-005FFh
MS-DOS
®
and BASIC work area
00600h-9FBFFh
User memory
Address Range
Use
0009FC00-0009FFFF
PS/2-mouse data area
000A0000-000BFFFF
Video RAM
000C0000-000CBFFF
Video BIOS
000CC000-000CDFFF
PC Card
000F0000-000FFFFF
System BIOS
Summary of Contents for Latitude CS
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