The DTC3x80 does not support DMA but it does have Pseudo-DMA which is
supported by the driver.
-It's DTC406 scsi chip is supposedly compatible with the NCR 53C400.
+Its DTC406 scsi chip is supposedly compatible with the NCR 53C400.
It is memory mapped, uses an IRQ, but no dma or io-port. There is
internal DMA, between SCSI bus and an on-chip 128-byte buffer. Double
buffering is done automagically by the chip. Data is transferred