ATZSC(4)              OpenBSD Programmer's Manual (Amiga)             ATZSC(4)

NAME
     atzsc - A2091 low level SCSI interface

SYNOPSIS
     atzsc0 at zbus0

DESCRIPTION
     The Amiga architecture uses a common machine independent scsi sub-system
     provided in the kernel source.  The machine independent drivers that use
     this code access the hardware through a common interface. (see
     scsibus(4)) This common interface interacts with a machine dependent in-
     terface, such as atzsc, which then handles the hardware specific issues.

     The atzsc interface handles things such as DMA and interrupts as well as
     actually sending commands, negotiating synchronous or asynchronous trans-
     fers and handling disconnect/reconnect of SCSI targets.  The hardware
     that atzsc uses is based on the WD33c93 SCSI chip.

HARDWARE
     The atzsc interface supports the following Zorro II expansion cards:

           A2091  Commodore SCSI adapter, manufacturer 514, product 2 or
                  product 3

DIAGNOSTICS
     sbicwait TIMEO @%d with asr=x%x csr=x%x  The 33c93 code (sbic) has been
     waiting too long for a SCSI chip operation to complete. %d is the line in
     the source file amiga/dev/sbic.c at which the SCSI chip timed-out.  Asr
     and csr are status registers withing the SCSI chip.

     atzsc%d: abort %s: csr = 0x%02x, asr = 0x%02x  A SCSI operation %s was
     aborted due to an error.

     atzsc%d: csr == 0x%02i  An error has occurred within the SCSI chip code.

     atzsc%d: unexpected phase %d in icmd from %d  The target described by
     `from %d' has taken the SCSI bus into a phase which is not expected dur-
     ring polled IO.

     atzsc%d: unexpected phase %d in icmd from %d  The target described by
     `from %d' has taken the SCSI bus into a phase which is not expected dur-
     ring DMA IO setup.

SEE ALSO
     scsibus(4)

HISTORY
     The atzsc interface first appeared in NetBSD 0.9A

OpenBSD 2.9                     August 31, 1994                              1
