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User’s Manual
92 ECB-870 User’s Manual
DMA-channel Usage
The DMA circuitry incorporates the functionality of two 8237 DMA controllers with seven
programmable channels. The controllers are referenced DMA Controller 1 for channels 0-
3 and DMA Controller 2 for channels 4-7. Channel 4 is by default used to cascade the two
controllers.
DMA-channel Description Note
DMA0 Available for PC/104 interface & PCI slot
DMA1 Available for PC/104 interface & PCI slot
DMA2 Standard Floppy Disk Controller
DMA3 Parallel port, if using ECP mode
DMA4 Used for cascading
DMA5 Available for PC/104 interface & PCI slot
DMA6 Available for PC/104 interface & PCI slot
DMA7 Available for PC/104 interface & PCI slot