Personal DECstation 5000 Model 50

This document provides step-by-step instructions for performing an R4000 series CPU upgrade on a Personal DECstation 5000 Model 50. It covers checking shipment contents, verifying that system software (ULTRIX/UWS 4.3A or later) is compatible, shutting down the system, the physical installation of the new CPU module, replacing system medallions, and booting the upgraded system. It also includes instructions for returning the original R3000 CPU module.