Specifications

Software Configuration
3–39
Memory Address Function
0100000h - 3FFFFFFh Extended memory
00F0000h - 00FFFFFh 64K ROM BIOS.
00D0000h - 00EFFFFh Byte-wide memory sockets S0 and S1 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
Table 3-14 Little Board/486i Memory Map
3.19 SYSTEM I/O MAP
Table 3-15 is a list of the I/O port assignments used on the Little Board/486i. The I/O port functions and
addresses (except for a few “Ampro reserved” addresses) shown in Table 3-15 are all standard for PC
compatibles from both a hardware and software perspective.
Typically, the ROM BIOS provides all the services needed to use the onboard devices and devices
connected to I/O ports. If you need to directly program the standard functions, refer to a programming
reference for the PC/AT.