Dma Channel Controllers - HP Kayak XU800 Technical Reference Manual

5 HP BIOS
BIOS Addresses
Default Values for
I/O Address Ports
0388 - 038B
03B0 - 03DF
03E8 - 03EF
03F0 - 03F5
03F6
03F7
03F8 - 03FF
04D0 - 04D1
0678 - 067B
0778 - 077B
0CF8 - 0CFF
8000 -
8400 -
8800 -

DMA Channel Controllers

Only "I/O-to-memory" and "memory-to-I/O" transfers are allowed.
"I/O-to-I/O" and "memory-to-memory" transfers are disallowed by the
hardware configuration. The system controller supports seven DMA
channels, each with a page register used to extend the addressing range of
the channel to 16 MB. The following table summarizes how the DMA
channels are allocated.
104
VGA
IDE primary channel
Flexible disk drive controller
COM1
System board resources under Windows 95
LPT1 ECP
PCI configuration space
DMA controller
Channel Function
DMA 0 Free
DMA 1 Free
DMA 2 Flexible disk drive controller
DMA 3 LPT ECP
DMA 4 DMA controller
DMA 5 Free
DMA 6 Free
DMA 7 Free
Function