• Applications designed for those models of the Apple II that don't have ports may ask which slot your printer, modem, or disk drive is connected to. You can use these applications—even if your peripheral devices are connected through ports—as long as you know which port corresponds to which slot. If you are asked for a slot number and your device is connected to a port, use Table C-1 to figure out which slot your port corresponds to.

Table C-1
Slots and ports

Slot 1

Slot 2

Slot 3

Slot 4

Slot 5

Slot 6

Slot 7

Printer port

Modem port

Text display

Mouse port on keyboard

3.5-inch disk drive in disk drive port

5.25-inch disk drive in disk drive port

AppleTalk in printer port or modem port

• The Apple IIc has a built-in disk drive, so applications developed for it may ask you whether you want to save a document on the disk in the built-in drive or on the disk in the external drive. You can use these applications on the Apple IIGS—just think of drive 1 as your built-in drive and drive 2 as your external drive.
   
• Applications designed for the Apple IIc may refer to an 80/40 switch because the Apple IIc has a switch on the case that you use to alternate between an 80-column and a 40-column display. The Apple IIGS doesn't have a switch, but you can change from an 80-column to a 40-column display by using the Control Panel Program, explained in Appendix A.
   
• Applications designed for the Apple IIe that require 128K may tell you that you need an extended 80-column card The Apple IIGS has all the functions of the extended 80-column card built-in (and then some), so don't rush out and buy one.

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Appendix C: Apple II Family Differences