Advantech SOM-4450 CPU System On Module SOM-4450 ETX - Manual (Page 31)

Appendix B System Assignments 2 5
B.2 DMA channel assignments
Table B-2: DMA channel assignments
Channel Function
0 Available
1 Available
2 Floppy disk (8-bit transfer)
3 Parallel**
4 Cascade for DMA controller 1
5 Available
6 Available
7 Available
** Parallel port DMA default setting: DMA 3
Parallel port DMA select: DMA 1, 3