Intel VS440FX - Motherboard Resources; Memory Map; DMA Channels

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2 Motherboard Resources
2.1 Memory Map
Table 8. Memory Map
Address Range (decimal) Address Range (hex) Size Description
1024 K - 262144 K 100000 - 10000000 255 MB Extended Memory
960 K - 1023 K F0000 - FFFFF 64 K System BIOS
944 K - 959 K EC000 - EFFFF 16 K Boot Block (available as UMB)
936 K - 943 K EA000 - EBFFF 8 K ESCD (Plug and Play configuration)
932 K - 935 K E9000 - E9FFF 4 K Reserved for BIOS
928 K - 931 K E8000 - E8FFF 4 K OEM Logo or Scan User Flash
896 K - 927 K E0000 - E7FFF 32 K POST BIOS (available as UMB)
800 - 895 K C8000 - DFFFF 96 K Available High DOS memory (open to ISA
and PCI bus)
640 K - 799 K A0000 - C7FFF 160 K Video memory and BIOS
639 K 9FC00 - 9FFFF 1 K Extended BIOS data (movable by memory
manager software)
512 K - 639 K 80000 - 9FBFF 127 K Extended conventional memory
0 K - 511 K 00000 - 7FFFF 512 K Conventional memory
2.2 DMA Channels
Table 9. DMA Channels
DMA Channel Number Data Width System Resource
0 8 or 16 bits Audio if present, else open
1 8 or 16 bits Audio if present, else open
2 8 or 16 bits Floppy Drive
3 8 or 16 bits Audio if present, else Parallel Port (for ECP
or EPP)
4 Reserved - Cascade Channel
5 16 bits Open
6 16 bits Open
7 16 bits Open