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4 HP BIOS
BIOS Addresses
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.
0378 - 037A LPT1
0388 - 038B AD1816 Ad-lib (FM)
03B0 - 03DF VGA
03E8 - 03EF COM3
03F0h- 03F5 Flexible disk drive controller
03F6 IDE primary channel
03F7 Flexible disk drive controller
03F8 - 03FF COM1
04D0 - 04D1 Interrupt edge/level control
0678 - 067B LPT2 ECP
0778 - 077B LPT1 ECP
0CF8 - 0CFF PCI configuration space
DMA controller
Channel Function
0 AD1816 Capture
1 AD1816 Playback
2 NS317 Flexible disk controller
3 NS317 LPT ECP
4 Used to cascade DMA channels 0-3
5Free
6Free
7Free
I/O Address Ports Function