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B.2 1st MB memory map
Table B.2: 1st MB memory map
Addr. range (Hex)
F0000h - FFFFFh
*CC000h - EFFFFh
C0000h - CBFFFh
B8000h - BFFFFh
B0000h - B7FFFh
A0000h - AFFFFh
00000h - 9FFFFh
* If Ethernet boot ROM is disabled (Ethernet ROM occupies about 16 KB)
* E0000 - EFFFF is reserved for BIOS POST
B.3 DMA channel assignments
Table B.3: DMA channel assignments
Channel
0
1
2
3
4
5
6
7
* Audio DMA select 1, 3, or 5
** Parallel port DMA select 1 (LPT2) or 3 (LPT1)
Device
System ROM
Unused (reserved for Ethernet ROM)
Expansion ROM (for VGA BIOS)
CGA/EGA/VGA text
Unused
EGA/VGA graphics
Base memory
Function
Available
Available (audio)
Floppy disk (8-bit transfer)
Available (parallel port)
Cascade for DMA controller 1
Available
Available
Available
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Chapter B
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