Reply 20 of 24, by mpe
Makes sense.
Impact of FD/HD is negligible given you are mostly transferring data in one way only.
Without bus master DMA, it will likely only use native DMA which will likely slow down performance roughly to the levels you see it (upper limit is about 1.6MB/S on systems with 16bit ISA). In fact it could be slightly faster if you don't set DMA channel and use a simple PIO (not sure if the Linux driver supports that).