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

NAME
     afsc - A4091 low level SCSI interface

SYNOPSIS
     afsc0 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 afsc, which then handles the hardware specific issues.

     The afsc 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 afsc uses is based on the NCR53c710 SCSI chip.

HARDWARE
     The afsc interface supports the following Zorro III expansion cards:

           A4091  Commodore SCSI adapter, manufacturer 514, product 84

DIAGNOSTICS
     afsc%s: abort %s: dstat %02x, sstat0 %02x sbcl %02x  The scsi operation
     %s was aborted due to error.  Dstat, sstat and sbcl are registers within
     the NCR53c710 SCSI chip.

     siop id %d reset0  The NCR53c710 SCSI chip has been reset and configure
     at id %d.

     SIOP interrupt: %x sts %x msg %x sbcl %x  The NCR53c710 SCSI chip has in-
     terrupted unexpectedly.

     SIOP: SCSI Gross Error  The NCR53c710 SCSI chip has indicated that it is
     confused.

     SIOP: Parity Error  The NCR53c710 SCSI chip has indicated that it has de-
     tected a parity error on the SCSI bus.

SEE ALSO
     scsibus(4)

HISTORY
     The afsc interface first appeared in NetBSD 1.0

OpenBSD 3.0                      July 23, 1995                               1
