Technical Information 1-17
The following Cache RAM is provided:
L1: 16KB (Internal Pentium)
L2: 256 KB write back (External).
Memory Map
The system supports system and video shadowing, both controlled through complementary
metal oxide semiconductor (CMOS). The system supports BIOS as a cacheable area with
write protection. Table 1-2 lists the system's memory map.
Table 1-2 Memory Map
Memory Space
Size
Function
00000000h-0009FFFFh
640 KB
Base Memory
000A0000h-000AFFFFh
64 KB
Video Buffer (EGA and VGA)
000B0000h-000B7FFFh
32 KB
Video Buffer (for monochrome modes)
000B8000h-000BFFFFh
32 KB
Video Buffer (for CGA, EGA color, and VGA color))
000C0000h-000C9FFFh
40 KB
Video BIOS (Last 8 KB reserved for Video BIOS
shadowing)
000CA000h-000CFFFFh
24 KB
Upper Memory Block (UMB)
000D0000h-000DFFFFh
64 KB
Used by Adapter ROMs
000E0000h-000E7FFFh
32 KB
Upper Memory Block (option cards or UMB)
000E8000h-000EFFFFh
32 KB
Upper Memory Block (UMB only)
000F0000h-000FFFFFh
64 KB
System BIOS ROM (includes the BIOS Setup utility,
and hard disk utilities)
00100000h-04FFFFFFh
79 MB
Extended Memory