NAME
asc —
VAXstation 4000 SCSI
controller
SYNOPSIS
asc* at vsbus? csr 0x200c0080 (VS-4000/60 or VLC)
asc* at vsbus? csr 0x25000080 (VS-4000/9x)
asc* at tc? (Not yet supported)
scsibus* at asc?
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(1) files:
- bits 0-7:
- disable disconnect/reselect for the corresponding SCSI
target
- bits 8-15:
- 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
cd(4),
ch(4),
esp(4),
scsi(4),
sd(4),
st(4),
vax/intro(4)
HISTORY
The
asc driver first appeared in
NetBSD
1.5.