Caple C871i Bedienungsanleitung PDF herunterladen (Seite 329)

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101

Apple II Computer Info

into timing problems like the one above.

Read Both Paddles at the Same Time

Insure both paddles are clear, then strobe the paddle switch.

Start counting, and look at both paddles.

As each paddle times out, save the counter value for the paddle.

By strategicly placing NOP instructions into the loop paths, you can

insure that the timing will stay constant for each pass of the counter.

When both paddles have timed out, you are done.

If you write in 65C816 code, you can read both paddle values with a single LDA

instruction. In fact, the code gets a lot tighter in 65C816 code, so your

resolution will be higher than the stock 0-254 of a 1 MHz 6502 call.

This factor can present some problems if the game is running on an accelerated

GS. So you'll want to calibrate the joystick for various speeds, and divide

the joystick results by an appropriate factor.

If you want the joystick routine to be of a consistent length, then you only

need to add on a dummy loop that will waste the time that would have been used

had both paddles been set to thier maximum (highest resistance) value.

I've got copies of routines (65C816) that do this type of thing. When I unpack

my GS, I'll try and upload an example.

[MGM]

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Apple II Computer Technical Information : Apple II Family Hardware Info

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