PowerBook 5300: Slow SCSI Extension Read Me

Name: Slow SCSI Extension
Version: 1.0f1
Released: August 13, 1996
Description: INIT to address a potential SCSI incompatibility between slow SCSI devices and the PowerBook 5300.

This software consists of a self-extracting archive. To use, download, double-click the downloaded file (this decompresses it).

Several PowerBook owners I know told me that I need to install something called the Slow SCSI Extension on my PowerBook 5300. What is it? How do I know if I really need it? Where can I get it?
From the Readme included with this archive:

Slow SCSI Extension

Slow SCSI Extension is an INIT for PowerBook 5300 series computers that addresses a potential conflict with slow SCSI devices such as 1x CD-ROM drives (like the Apple CD150), Zip drives, and PowerBooks in SCSI disk mode. Not all PowerBooks will experience the problem and a PowerBook that does may not experience the problem all the time (even with different units of the same make and model).

Important: You should only install this extension if you are experiencing constant freezes or crashes when transfering files with a particular slow SCSI device. Installing this extension will impact performance with ALL SCSI devices by 10 to 50 percent, so only install it if it is absolutely needed! You can use the Extensions Manager to disable Slow SCSI Extension when it is not needed.

To install Slow SCSI Extension, put it in the Extensions folder and restart.

This software is posted to Apple Software Updates online. It is provided "as is" and is not supported by Apple technical support.
Published Date: Feb 18, 2012