Hardware Configuration Features B-11Table B-9 provides a map of the upper memory area.Some of these addresses are dedicated to various systemdevices, such as the system/video basic input/output sys-tem (BIOS). Others are available for use by expansioncards and/or an expanded memory manager (EMM).When the microprocessor or a program addresses a loca-tion within the upper memory area, it is physicallyaddressing a location within one of these devices.Table B-9. Conventional Memory MapAddress Range Use00000h–003FFh Interrupt vector table00400h–004FFh BIOS data area00500h–005FFh MS-DOS and BASICwork area00600h–0FFFFh User memory10000h–1FFFFh User memory20000h–2FFFFh User memory30000h–3FFFFh User memory40000h–4FFFFh User memory50000h–5FFFFh User memory60000h–6FFFFh User memory70000h–7FFFFh User memory80000h–8FFFFh User memory90000h–9FBFFh User memoryNOTE: For the full name of an abbreviation or acronymused in this table, see the Glossary.Table B-10. Upper Memory MapAddress Range Use0009FC00–0009FFFF PS/2-mouse data area000A0000–000BFFFF Video RAM000C0000–000C7FFF Video BIOS000C8000–000EFFFF Available000F0000–000FFFFF System BIOS00100000–0010FFEF High memory area0010FFF0–1FFFFFFF Extended memory20000000–FFFBFFFF ReservedFFFC0000–FFFFFFFF BIOS ROMNOTE: For the full name of an abbreviation or acronymused in this table, see the Glossary.
