.\"	$OpenBSD: uturn.4,v 1.5 2004/09/26 20:11:51 mickey Exp $
.\"
.\" Copyright (c) 2004 Michael Shalayeff
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.Dd September 13, 2004
.Dt UTURN 4 hppa
.Os
.Sh NAME
.Nm uturn
.Nd U2/Uturn, Runway to GSC Bus bridge & IOA
.Sh SYNOPSIS
.Cd "uturn* at mainbus?"
.Cd "dino* at uturn?"
.\" .Cd "elroy* at uturn?"
.Cd "lasi* at uturn?"
.\" .Cd "sti* at uturn?"
.Sh DESCRIPTION
.Nm
provides the functionality of IOA (not currently supported) as a bridge
from the Runway bus (see
.Xr runway 4
for more information) to GSC.
Modern systems, based on the PA-8000 and later 64-bit CPUs, use the
.Nm U-Turn
version, whilst earlier systems, based on the PA-7200 CPU, used
a different version of the chip called
.Nm U2 .
.Sh SEE ALSO
.Xr cpu 4 ,
.Xr dino 4 ,
.\" .Xr elroy 4 ,
.Xr gsc 4 ,
.Xr intro 4 ,
.Xr pci 4 ,
.Xr runway 4
.Sh HISTORY
The
.Nm
driver
appeared in
.Ox 3.7 .