
Appendix D System Assignments 133
D.2 1st MB memory map
Table D-2: 1st MB memory map
Addr. range (Hex) Device
F000h - FFFFFh System ROM
**DC000h - EFFFFh Unused
*CC000h - DBFFFh 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 enabled
** E0000 - EFFFF is reserved for Pentium
®
POST
D.3 DMA channel assignments
Table D-3: DMA channel assignments
Channel Function
0 Available
1 Available (audio)
2 Floppy disk (8-bit transfer)
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)
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