divided into conventional memory (sometimes called base memory) and upper memory. 7DEOHAll system%￿￿￿￿memory&RQYHQWLRQDO0HPRU\above this 1 MB is called0DSextended memory and cannot be directly addressed$GGUHVV5DQJHby MS-DOS–based8VHprograms 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.

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

90000h–9FBFFh

User memory

 

 

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

Table B-11 provides a map of the upper memory area. Some of these addresses are dedicated to various system devices, such as the system BIOS. Others are available for use by expansion cards and/or an expanded memory manager (EMM). When the processor or a program addresses a location within the upper memory area, it is phys- ically addressing a location within one of these devices.

B-18Dell Precision 610 Mini Tower Systems User’s Guide

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Dell manual 18Dell Precision 610 Mini Tower Systems User’s Guide