Dell Precision 610 Dell Precision WorkStation 610 Mini Tower Systems User's Gu - Page 166

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 memorymanaging 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 physically addressing a location within one of these devices. B-18 Dell Precision 610 Mini Tower Systems User's Guide