Caple C871i Manual do Utilizador descarregar pdf (Página 225)

100

101

Apple II Computer Info

add .01 uF cap* between [5] & [3] [ 6] & [ 8]

optional: for fine-tuning,

add 50K-100K trim pot

in series with the cap

add .01 uF cap* between [8] & [3] [10] & [ 8]

optional: for fine-tuning,

add 50K-100K trim pot

in series with the cap

*Note: The Capacitors compensate for smaller R range of PC

sticks.The C values are approximate. For standard 100K Ohm

PC sticks, .01 uF pretty well guarantees you will be able to

cover the full Apple II X and Y range (0-255).

Values of .01 uf (X-axis) and .005 uF (Y-axis) worked

well for a PC "FlightStick" when plugged into our Apple II+.

For checking and adjusting stick performance on your Apple II, use

a program which continuously reads and displays X and Y stick values.

The program below does this and displays "B0" when Button 0 is pushed

and "B1" when Button 1 is pushed. Do a CTRL-C to exit.

20 PRINT "X= "; PDL(0); TAB(15); "Y= ";PDL(1); TAB(30);

30 IF PEEK(49249)>127 THEN PRINT " B0";

40 IF PEEK(49250)>127 THEN PRINT " B1";

50 PRINT: GOTO 20

Note: If your Apple II uses an accelerator chip or board, make sure that

it "slows down" for joystick accesses or just set Speed to "Normal"

(1MHz).

Most likely, you will find that the a stick tops-out too early in

the X-max and/or Y-max direction. For best control precision, what you

want is for extreme values to occur near the extremes of stick movement:

X (horizontal) Left= 0 Right= 255

Y (vertical) Up= 0 Down= 255

This way, you have lots of active swing which makes graphics

work and playing most games much easier.

If you included the trim pots in your converter, adjusting for

maximum active swing will be easy. If your converter does not include

the trim pots, experiment with swapping in capacitance values between

..002 uF and .01 uF to get the best control 'spread'.

The converter I built fit inside heat-shrink tubing. Putting it in

a small plastic box may be better. You could mount the trim pots (and/or

switches with fixed "trim resistors") and select between settings for a

'Fast', short swing, 'hot' Game Stick and a 'Normal', full swing, 'cool'

Game/Graphics Stick.

Rubywand

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Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 225 of 572

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Caple C871i Manual do Utilizador Página 225

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