Memory – Dell Inspiron 3700 User Manual
Page 80
Memory
Memory Allocations
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
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
I/O Memory Map
provides a map of memory addresses reserved by the system for peripheral I/O devices. Use the information in Table 6 to determine if the
memory address of an external peripheral (such as a PC Card) conflicts with a memory address reserved by the computer.
Check the documentation of the external I/O device to determine its memory address. If there is a conflict with a memory address reserved by the
computer, change the address of the device.
Table 6. I/O Memory Map
IRQ10
Available for use by a PC Card or audio controller unless the APR is attached
IRQ11
Generated by USB, PC Card, and audio controllers; available for use by a PC Card
IRQ12
Reserved; generated by the keyboard controller to indicate that the output buffer of the DualPoint integrated pointing device or the
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 the CD-ROM drive in the media bay to indicate that the drive requires the attention of the microprocessor
NOTE: To view memory allocations in 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-00FFFF
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 random-access memory (RAM)
000C0000-000CFFFF
Video BIOS
000CC000-000CDFFF
Reserved for PC Card
000F0000-000FFFFF
System BIOS
00100000-03FFFFFF
High memory area
FD000000-FDFFFFFF
Video RAM
FF200000-FF2FFFFF
Video RAM
FFFE0000-FFFFFFFF
BIOS ROM
NOTE: To view I/O addresses in 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.