User`s guide

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.
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010- I have a Koala Pad with a 9-pin DIN female plug. I
guess it's a C-64 model. Can I convert a C-64 Koala Pad
to work on my Apple II?
Since the standard Commodore-64 9-pin DIN port is male, it looks like your
Koala Pad (with a female plug) is, indeed, intended to work on a C-64, VIC-20,
etc. machine.
As to whether or not the C-64 Koala Pad can be used on an Apple II, it
looks like, probably, it can, if you can find or build an adapter. This is,
really, a guess. It is based upon the capabilities of the C-64 Game port, time
constant capacitor values used in the C-64, and the probability that Koala Pad's
makers would not wish to make major design changes between Apple and C-64
models.
Although C-64 joysticks are of the simple "switcher" type which connect to
Game port switch inputs, the C-64 Game port also includes X and Y analog
"paddle" inputs. These are at pin 9 (X) and pin 5 (Y).
The C-64 manual does not ever seem to specify an optimal max R value for
the pots connected to these inputs; but, the capacitor part of the expected R/C
circuit is 1000 pF in each case and the caps go to ground just as they do in the
Apple II.
In short, the C-64 "paddle" inputs look very much like the Apple II
joystick inputs. A _try_ at an adapter would look something like the following
...
To C-64 Koala Pad To Apple II Game Port
(9-pin male DIN) (9-pin male DIN)
1 ?
2 ? 2nd Button -> 1
3 ?
4 ?
5 <- PDL1 (Y) -> 8
6 <- main button -> 7
7 <- +5V line -> 2
8 <- GND -> 3
9 <- PDL0 (X) -> 5