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Your application asks for the slot and drive of the disk you want to save to, but your drive is connected to the disk drive port.

Earlier models of the Apple II didn't have ports, so slot and drive number was a logical way to identify the location of your disk.

The 3.5-inch disk drives connected to the disk drive port correspond to slot 5. The 5.25-inch disk drives connected to the disk drive port correspond to slot 6.

Your application saves everything to drive 1, but you want to save to drive 2.

The application is saving to the default, or current, drive—the drive it thinks you want to use.

Read the manual that came with the application to find out how to change the default drive. Some applications have you fill out a preference form that says how many disk drives are connected to your computer. Some have a command called Select Volume or Set Prefix that lets you specify which disk to save to.

You get the message ILLEGAL FILENAME when you try to save a document on a disk.

Filename refers to the name of your document. An illegal filename is a name that doesn't conform to the rules for naming files.

Different applications have different requirements, but you can't go wrong if your filename starts with a letter, has fewer than 15 characters, and doesn't have any spaces or punctuation marks other than periods.