AL440LX Motherboard Product Guide
49
Motherboard Resources
Memory Map
Table 31. Memory Map
Address Range (decimal) Address Range (hex) Size Description
1024 K - 393216 K 100000 - 18000000 383 MB Extended memory
1008 K - 1024 K FC000 - FFFFF 16 KB Boot block
1000 K - 1008 K FA000 - FBFFF 8 KB ESCD (Plug and Play configuration and DMI)
996 K - 1000 K F9000 - F9FFF 4 KB Reserved for BIOS
992 K - 996 K F8000 - F8FFF 4 KB OEM Logo or Scan User Flash
928 K - 992 K E8000 - F7FFF 64 KB POST BIOS
896 K - 928 K E0000 - E7FFF 32 KB POST BIOS (Available as UMB)
800 K - 896 K C8000 - DFFFF 96 KB Available high DOS memory (open to ISA
and PCI bus)
640 K - 800 K A0000 - C7FFF 160 KB Video memory and BIOS
639 K - 640 K 9FC00 - 9FFFF 1 KB Extended BIOS data (movable by memory
manager software)
512 K - 639 K 80000 - 9FBFF 127 KB Extended conventional memory
0 K - 512 K 00000 - 7FFFF 512 KB Conventional memory
DMA Channels
Table 32. DMA Channels
DMA Channel Number Data Width System Resource
0 8- or 16-bits Audio
1 8- or 16-bits Audio / parallel port
2 8- or 16-bits Floppy drive
3 8- or 16-bits Parallel port (for ECP)/audio
4 Reserved - cascade channel
5 16-bits Open
6 16-bits Open
7 16-bits Open
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