uturn4
U2/uturn, runway to gsc bus bridge & ioa
Usage
uturn* at mainbus? astro* at uturn? dino* at uturn? lasi* at uturn? gecko* at uturn? sti* at uturn?
Overview
uturn provides the functionality of IOA (not currently supported) as a bridge from the Runway bus (see runway(4) for more information) to GSC. Modern systems, based on the PA-8000 and later 64-bit CPUs, use the U-Turn version, whilst earlier systems, based on the PA-7200 CPU, used a different version of the chip called U2.