ASC(4)                OpenBSD Programmer's Manual (PMAX)                ASC(4)

NAME
     asc - TurboChannel SCSI adaptor

SYNOPSIS
     asc? at ioasic?
     asc? at tc?
     oldscsibus* at asc?
     scsibus* at asc?

DESCRIPTION
     The asc driver provides support for the NCR 53c94-based scsi host adaptor
     on the DECstation 5000 series, and for the PMAZ-AA and related TurboChan-
     nel SCSI-adaptor option boards.  The asc is a medium-performance imple-
     mentation of the SCSI-I common set supporting synchronous and asyn-
     chronous SCSI devices.  The driver provides no support for targets with
     multiple logical unit numbers (LUNs).

SEE ALSO
     cd(4), ch(4), intro(4), rz(4), sd(4), st(4), tz(4)

HISTORY
     The asc driver first appeared in 4.4BSD.

BUGS
     The asc driver only supports the oldscsibus higher-level layer, and the
     rz and tz devices, which first appeared in 4.4BSD/pmax. It should be  re-
     written to support the scsibus machine-independent higher-level SCSI lay-
     er and the sd, st, and cd drivers. This is currently under development.

OpenBSD 2.9                     August 6, 1996                               1
