Specifications

D
Device Mapping
Tables D–1 through D–5 list the computer system’s memory, I/O address,
interrupt, and DMA maps.
Resources used by the system board are shown in Table D–1. Resources
used by option modules are not shown. Use the SCU to view total system
resources.
Table D–1 Memory Map, Without Options
Address Range (Hex) Function Size Shadow Cache WP
1
0010 0000–01FF FFFF Extended memory 63 MB No Yes No
000F 0000–000F FFFF System BIOS 64 KB Yes Yes Yes
000E 8000–000E FFFF Reserved system resources
2
32 KB No Yes Yes
000E 0000–000E 7FFF On-board video BIOS
extension
32 KB No Yes Yes
000D 0000–000D FFFF Available for options 64 KB No Yes Yes
000C 8000–000C FFFF Available for options 32 KB No Yes Yes
000C 0000–000C 7FFF Video BIOS (when mapped) 32 KB Yes Yes Yes
000A 0000–000B FFFF Video RAM 128 KB No Yes Yes
0000 0000–0009 FFFF Base memory 640 KB No Yes Yes
1
Write protected (not cached in the Intel 486).
2
Used only before operating system boot.
Device Mapping D–1