Regained support for MFM disks on VS2000

Anders Magnusson has checked in fixes to use the VS2000 MFM disks again. Along with that, VS2000 SCSI DMA should be able to cooperate with it. VS2000 still doesn't have floppy support back yet, since there is no obvious way to detect which type of drive there is. More details are available in Ander's announcement in the port-vax mail archive. [0 comments]