
ATAPISCSI(4)              OpenBSD Programmer's Manual             ATAPISCSI(4)

NAME
     atapiscsi - ATAPI<->SCSI adapter

SYNOPSIS
     atapiscsi* at wdc? channel ?
     atapiscsi* at pciide? channel ?
     scsibus* at atapiscsi?

DESCRIPTION
     The atapiscsi driver supports ATAPI (also called IDE) devices such as CD-
     ROMs, ZIP drives, floppy drives, and (eventually) tape drives.  All ATAPI
     devices talk some subset of the SCSI protocol. For example, the SCSI
     cd(4),  sd(4),  and st(4) drivers are able to sucessfully control the
     corresponding ATAPI devices.

     The atapiscsi driver acts like a SCSI adapter.  Thus, the ATAPI devices
     connected to the system will appear as SCSI devices.

     For performance reasons, one should avoid putting an ATAPI device and a
     hard disk on the same cable.  The driver does not support bus release
     and, even if it did, many ATAPI devices do not support it. There is only
     one command outstanding on a cable at a time. For example, if a a hard
     disk and a CD drive are placed on the same cable, the hard disk requests
     may get queued behind slower CD operations.

BUGS
     Tape devices don't work yet.

SEE ALSO
     intro(4),  pciide(4),  scsi(4),  wdc(4),  cd(4),  st(4),  sd(4)

OpenBSD 2.6                      July 25, 1999                               1
