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35 .Nd Western Digital WD33c93 SCSI Bus Interface Controller
37 .Cd "wdsc0 at pcc? ipl 2"
41 driver provides an abstraction layer between the SCSI hardware
44 MVME147 single board computer (WD33C93), and the machine
45 independent SCSI drivers described in
48 In addition to sending the required SCSI commands to
49 target devices on the SCSI bus, the
51 driver deals with DMA, device interrupts, sync/async negotiation
52 and target disconnects/reconnects.
59 Negotiation of Synchronous SCSI data transfers has been
60 deliberately disabled in the MVME147's
62 driver as it has proved extremely difficult to make it
63 work reliably in this mode.
67 driver does not respond well to exceptional conditions
68 caused by poor SCSI cabling and/or termination. In those
69 instances the machine is likely to require a hard reset
74 driver should be blown away and replaced with a machine independent