NAME
asc —
VAXstation 4000 SCSI
controller
SYNOPSIS
asc* at vsbus? csr 0x200c0080 (VS4000/60
or VLC)
asc* at vsbus? csr 0x25000080 (VS4000/9x)
DESCRIPTION
The asc driver provides support for the
NCR 53c94-based SCSI host adapter on the VAXstation 4000 series, and for the
PMAZ-AA and related TURBOchannel SCSI adapter option boards (also on the
VAXstation 4000 series models which include support for the TURBOchannel
adapter.
CONFIGURATION
The asc driver supports the following
flags
for use in config(8) files:
- bits 0-7:
- disable disconnect/reselect for the corresponding SCSI target
- bits 16-23:
- disable synchronous negotiation for SCSI target
"Target" is synonymous with SCSI ID number.
Note that SCSI tape drives should be allowed to perform disconnect/reselect or performance will suffer.
SEE ALSO
HISTORY
The asc driver first appeared in
NetBSD 1.5. It has been supported in
OpenBSD since release 2.8.