Ampro Corporation 486E - Manual (Page 26)

Little Board™/486e Technical Manual
2–10
Table 2–6. Little Board/486e Memory Map
Memory Address Function
0100000h – 3FFFFFFh Extended memory
00F0000h - 00FFFFFh 64K ROM BIOS
00D0000h - 00EFFFFh Byte-wide socket S0, if enabled, otherwise, free
00CC000h – 00CFFFFh Onboard BIOS Expansion Flash device for Ethernet
boot PROM code
00C0000h - 00CBFFFh Video BIOS for onboard flat panel video controller
00A0000h - 00BFFFFh Normally contains video RAM, as follows:
CGA Video: B8000-BFFFFh
Monochrome: B0000-B7FFFh
EGA and VGA video: A0000-AFFFFh
000000h - 09FFFFh Onboard DRAM
Expanded Memory and Extended Memory
Extended memory is a contiguous linear block of memory above 1M byte. Some programs require
that memory be available as expanded or EMS memory, which makes memory available as pages
rather than as a contiguous block. The procedure for accessing expanded memory is defined in the
EMS LIM 4.0 specification.
Expanded memory can be converted into EMS memory by using the EMS emulation utilities in
DOS. Current versions of DOS provide EMS emulation utilities, such as EMM386, that conform to
the LIM 4.0 specification. Refer to the DOS technical documentation for instructions for using the
EMS emulation utility.