PowerBook 3400: SerialDMA 2.1 Update Not Supported

I downloaded the SerialDMA 2.1 Update from Apple's web site but when I try to install it on my PowerBook 3400, I get a message saying I don't need it. Yet the instructions that come with it say that PowerBook 3400 owners should install the update. What's the story?
The SerialDMA 2.1 Update fixes a specific problem with a specific I/O chip. The PowerBook 3400 has a different I/O chip and therefore will not benefit from the fixes that SerialDMA 2.1 Update provides. The instructions accompanying the update are in error in stating that PowerBook 3400 owners should install the update. The installer is correct in telling you that the update isn't required on the PowerBook 3400.

If you are having issues with serial devices connected to your PowerBook 3400 and the symptoms sound similar to those described by the SerialDMA 2.1 Update instructions, please contact the manufacturer of the serial device for information on how to correct the problem. Installing the SerialDMA 2.1 Update will not solve these issues.

The Tech Info Library Article 17159: "Locating Vendor Information" can help you search for a particular vendor's address and phone number.
Published Date: Feb 18, 2012