Dma Channel Controllers - HP Kayak XA Technical Reference Manual

4 HP BIOS
BIOS Addresses
I/O Address Ports
0378 - 037A
0388 - 038B
03B0 - 03DF
03E8 - 03EF
03F0h- 03F5
03F6
03F7
03F8 - 03FF
04D0 - 04D1
0678 - 067B
0778 - 077B
0CF8 - 0CFF

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.
DMA controller
Channel
0 AD1816 Capture
1 AD1816 Playback
2 NS317 Flexible disk controller
3 NS317 LPT ECP
4 Used to cascade DMA channels 0-3
5 Free
6 Free
7 Free
82
LPT1
AD1816 Ad-lib (FM)
VGA
COM3
Flexible disk drive controller
IDE primary channel
Flexible disk drive controller
COM1
Interrupt edge/level control
LPT2 ECP
LPT1 ECP
PCI configuration space
Function
Function