Can you examplify setups that will cause DMA not to work ?
Buster 7: no DMA at all
Buster 9: several Zorro III busmasters possible, but only with workaround (aka Fastlane).
Buster 11: only one active Zorro III busmaster.
Zorro III busmasters are:
- A3000T/A4000T internal SCSI controller (unfortunately)
- any DMA card like A4091 and Fastlane Z3
- Deneb
Only Zorro III busmasters with Buster 9 workaround: Fastlane Z3 and Deneb.
So: internal SCSI on A3000T/A4000T is a pitfall!
DMA examples:
- A4000D, A4091, Buster 9/11, Deneb
- A4000T, no internal SCSI, Buster 11, Deneb
no DMA examples:
- A4000T, internal SCSI in use, Buster 9/11, Deneb
- A4000T, no internal SCSI in use, Buster 11, A4091, Deneb
Non-DMA Zorro III cards do not influence the DMA systems, neither do CPU port turbo cards with own SCSI controller.
Michael