WDSC(4) BSD Kernel Interfaces Manual WDSC(4)
wdsc -- WD33c93 SCSI controller
wdsc* at hpc? (sgi)
The wdsc driver provides support for the Western Digital WD33c93 and
WD33c93B SCSI controllers.
In addition to sending the required SCSI commands to target devices on
the SCSI bus, the wdsc driver deals with DMA, device interrupts,
sync/async negotiation, and target disconnects/reconnects.
Bits 0-7 Disable disconnect/reselect for the corresponding target
Bits 8-15 Disable synchronous negotiation for target "[bit - 8]"
Bits 16-23 Disable tagged queuing for target "[bit - 16]"
The wdsc device flags may be OR'd together to enable any combination of
the features listed above. Tape devices should be allowed to disconnect
for the SCSI bus to operate acceptably.
hpc(4), intro(4), scsibus(4)
BSD April 27, 2017 BSD