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73 Appx. C
C.2 1st MB memory map
778-77A Printer Port (ECP Extensions)(Port 378+400)
MPU-401 select from 300 ~ 330H (2 bytes)
Table C.2: 1st MB memory map
Addr. range (Hex) Device
F0000h - FFFFFh System ROM
*CC000h - EFFFFh Unused (reserved for Ethernet ROM)
C0000h - CBFFFh Expansion ROM (for VGA BIOS)
B8000h - BFFFFh CGA/EGA/VGA text
B0000h - B7FFFh Unused
A0000h - AFFFFh EGA/VGA graphics
00000h - 9FFFFh Base memory
*
If Ethernet boot ROM is disabled (Ethernet ROM occupies about 16 KB)
* E0000 - EFFFF is reserved for BIOS POST
Table C.1: System I/O ports
Addr. range (Hex) Device