Dma Channel Controllers - HP XM600 - Kayak - 128 MB RAM Technical Reference Manual

5 HP BIOS
BIOS Addresses
Default Values for
I/O Address Ports
03F8 - 03FF
04D0 - 04D1
0678 - 067B
0778 - 077B
0CF8 - 0CFF
C000 -
C100 -

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.
108
COM1
Interrupt edge/level control
LPT2 ECP
LPT1 ECP
PCI configuration space
Power Management I/O space and ACPI Registers
MBus I/O space
DMA controller
Channel Function
DMA 0 Free
DMA 1 Free if not used for parallel port in Setup
DMA 2 Floppy disk drive controller
DMA 3 Free if not used for parallel port in Setup
DMA 4 Used to cascade DMA channels 0-3
DMA 5 Free
DMA 6 Free
DMA 7 Free
Function