This article comprises the Read Me for Apple Ethernet Speed and Duplex Tool version 6.2.1a4c1. This software was released by Apple on 21 July 1999 and is available for downloading from the Apple Software Updates Web site. Use the following URL to access the download directly:

http://asu.info.apple.com/swupdates.nsf/artnum/n11488

Description
Apple Ethernet Speed and Duplex Tool is an unsupported system extension that allows you to disable the auto negotiation and set the speed (10 Mbit or 100 Mbit) and duplex (Full or Half) for the built in Ethernet of an Apple iMac, a Power Macintosh G3 (Blue and White version only), or a 1999 PowerBook G3 (Bronze version only). This is intended for use on both server and client Macintoshes.

Requires
Apple iMac, Power Macintosh G3 (Blue and White version only), and 1999 PowerBook G3 (Bronze version only) using built in Ethernet.

Note: this software is not for the iMac with slot-loading CD-ROM drives, Power Macintosh G4, or iBook.

• Introduction
• Installation and Documentation
• Requirements for Duplexer
• Support
• Notes About Duplexer

• Do not rename the extensions and they must load as early as possible.
• All failures and errors are printed directly to the screen. It will overwrite anything on the screen and will not "redraw" nicely. This is the only way to show errors at this time.

• You can use a standard resource editing program (like ResEdit) to customize it. Only make changes on a copy of the files.
• Set the 'PREF' #128 "debugFlag" to be 0x00000001 to see various progress and debugging information printed directly to your screen.
• Set the 'PREF' #129 "Duplex Setting" to one of the following settings:
  0x00000001 to get 10 Mbit, half duplex
  0x00000002 to get 10 Mbit, full duplex
  0x00000003 to get 100 Mbit, half duplex
  0x00000004 to get 100 Mbit, full duplex
  0x00000005 to get Auto Negotiation (or just remove Duplexer from the system folder)