3. In ACPI mode, IRQ9 is used for the SCI (System Control Interrupt). The SCI can be
shared with a PCI interrupt line.
8.4 Direct Memory Access (DMA) Channels
Table 40
DMA Channels
DMA#
Data Width
Available
Description
0
8 bits
Yes
1
8 bits
Yes
2
8 bits
Note 1
Floppy Drive Controller
3
8 bits
Note 2
Parallel Port (LPT)
4
16 bits
No
Cascade DMA Controller
5
16 bits
Yes
6
16 bits
Yes
7
16 bits
Yes
Notes
1. If the corresponding device is disabled in BIOS setup then the DMA channel can be
used by customers hardware.
2. Not available if Parallel Port is used in ECP mode (Enhanced Parallel Port).
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