C.2 1st MB memory map
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
C.3 DMA channel assignments
Table C.3: DMA channel assignments
Channel | Function |
|
|
0 | Available |
1 | Reserved (audio) |
2 | Floppy disk |
3 | Available (parallel port) |
4 | Cascade for DMA controller 1 |
5 | Available |
6 | Available |
7 | Available |
*Audio DMA select 1, 3, or 5
**Parallel port DMA select 1 (LPT2) or 3 (LPT1)
Appendix C System Assignments
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