55 PCA-6781 User Manual
Appendix C System Assignments
C.2 1st MB Memory Map
C.3 DMA Channel Assignments
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
* E0000 - EFFFF is reserved for BIOS POST
Table C.3: DMA Channel Assignments
Channel Function
0 Available
1 Available (audio)
2 Floppy disk (8-bit transfer)
3 Available (printer port)
4 Cascade for DMA controller 1
5 Available
6 Available
7 Available
* Audio DMA select 1, 3, or 5
** Printer port DMA select 1 (LPT2) or 3 (LPT1)
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