This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
The Koala Pad is drawing pad peripheral. It 'looks like' a two-button joystick to your Apple II. So, any software which accepts joystick input can use the pad. This includes the paint program originally included with the pad (the "Koala Micro-Illustrator"), "Blazing Paddles", "Dazzle Draw", "816 Paint", and many other programs. The Koala Pad has the old 16-pin game plug. It is supposed to be plugged into the Old Game Port socket. This is an 'IC socket' near the back right side of the Apple II (II+, IIe, IIgs) motherboard. The cable end should be facing toward the back. It's a good idea to get a 9-pin plug -to- 16-pin socket converter cable so that the pad can be plugged into the newer, external, 9-pin Game Port. This makes it much easier to unplug the pad when you want to swap-in a joystick for games. The converter cable is not hard to build; or, you may find one at a swap meet. You can test your KoalaPad using software which checks joysticks. For example, touching the stylus to the upper left corner outputs X,Y readings close to 0,0; touching the stylus to the lower right corner outputs X,Y readings of 255,255. Near the center of the pad, the output is about 130,130. Some indication of shrinkage or stretching on the pad seems to be normal. Our pad does not present a 'slate flat' look either; but, it works fine. Before deciding that your pad is defective, try it out on a joystick checker program. If you are using some kind of accelerator on your Apple ][, be sure to set speed to 1MHz. Similarly, you can check your software by substituting a joystick for the KoalaPad. By: Rubywand ------------------------------