I don't think any Amiga NIC uses DMA - it'd take a lot more logic to accomplish than is visible on the card and noboby had the performance needs back in those days. There were very few ISA NICs with DMA, the only one I remember was an SMC (EtherPlus?). 3C509, NE2000 were PIO mode only. The 3Com cards used a clever buffer design that actually had the same performance as SMC for half the price.
