ASC(4) OpenBSD Programmer's Manual (VAX) ASC(4)NAME
asc - VAXstation 4000 SCSI controller
asc* at vsbus? csr 0x200c0080 (VS4000/60 or VLC)
asc* at vsbus? csr 0x25000080 (VS4000/9x)
scsibus* at asc?
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.
The asc driver supports the following flags for use in config(8) files:
bits 0-7: disable disconnect/reselect for the corresponding SCSI
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 ALSOcd(4), ch(4), intro(4), scsi(4), sd(4), st(4), uk(4)HISTORY
The asc driver first appeared in NetBSD 1.5. It has been supported in
OpenBSD since release 2.8.
OpenBSD 4.9 July 3, 2010 OpenBSD 4.9