Dell 610 Memory Allocations, Table B-10. Conventional Memory Map Address Range Use

IRQ6	Diskette drive interface
IRQ7	Parallel port
IRQ8	RTC
IRQ9	Available if ACPI is set to Off in System Setup program
IRQ10	Available
IRQ11	Available
IRQ12	Mouse controller
IRQ13	Math coprocessor
IRQ14	Primary EIDE interface (if Enabled in System Setup program)
IRQ15	Secondary EIDE interface (if Enabled in System Setup program)

NOTE: For the full name of an abbreviation or acronym used in this table, see the "Glossary".

Memory Allocations

A processor and programs operating under MS-DOS (real-mode operation) can address only 1 megabyte (MB) (1024 kilobytes [KB]) of system memory. This area is divided into conventional memory (sometimes called base memory) and upper memory. All system memory above this 1 MB is called extended memory and cannot be directly addressed by MS-DOS-based programs without the aid of some special memory-managing software.

Table B-10 provides a map of the conventional memory area. When the processor or a program addresses a location within the conventional memory range, it is physically addressing a location in main memory, which is the only main memory it can address under MS-DOS.

Table B-10. Conventional Memory Map
	Address Range	Use
	00000h-003FFh	Interrupt vector table
	00400h-004FFh	BIOS data area
	00500h-005FFh	MS-DOS and BASIC work area
	00600h-0FFFFh	User memory
	10000h-1FFFFh	User memory
	20000h-2FFFFh	User memory
	30000h-3FFFFh	User memory
	40000h-4FFFFh	User memory
	50000h-5FFFFh	User memory
	60000h-6FFFFh	User memory
	70000h-7FFFFh	User memory
	80000h-8FFFFh	User memory