The computer doesn't recognize your UniDisk™ 3.5.

Your UniDisk 3.5 is connected to a disk drive controller card instead of to the disk drive port and you're using the Fast system speed.

Connect your UniDisk 3.5 to the disk drive port or change System Speed in the Control Panel to Normal.

You get the message UNABLE TO LOAD PRODOS.

Fast speed might be interfering with the application.

Try setting System Speed in the Control Panel Program to Normal.

Typing PR# and a slot number activates one of your disk drives instead of the device you intended.

The Control Panel is set to Your Card for that slot. When a can't find a card, it doesn't know what to do.

If your disk drive keeps spinning, press Control-Reset to stop the disk drive.
Change the Control Panel setting to the port instead of Your Card.

You can't start up DOS 3.2 applications on the Apple IIGS directly, but you can start them up by using a program called START13 on the DOS 3.3 System Master disk. If you don't have the disk, see if you can get a copy from someone at your local Apple users group or from your authorized Apple dealer.

The procedure for using START13 is explained below:

1. Start up the DOS 3.3 System Master disk.
    
2. Type RUN START13 and press Return.
   
   You'll see the message:
   
   13-SECTOR BOOT UTILITY SLOT TO BOOT FROM (DEFAULT=6)?
   
3. Remove the disk, put the DOS 3.2 disk in drive 1, and press Return to indicate that your disk controller card is in slot 6 or the corresponding port. Of your disk drive controller card is in some other slot, type the slot number before you press Return.)

When disk are formatted, for DOS they are divided into tracks and sectors—sections where information can be stored. DOS 3.2 disk are divided into 13 sectors. DOS 3.3 disk are divided into 16 sectors.

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Appendix B: Troubleshooting