Caple C871i Bedienungsanleitung PDF herunterladen (Seite 233)

Apple II Computer Info

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### Created : Sunday, January 14, 1996 Modified: Sunday, January 14, 1996

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Path: blue.weeg.uiowa.edu!news.uiowa.edu!uunet!usc!elroy.jpl.nasa.gov!netline-

fddi.jpl.nasa.gov!nntp-server.caltech.edu!nathan

From: [email protected] (Nathan Mates)

Newsgroups: comp.sys.apple2.programmer

Subject: Re: Joystick Code... Help Please!

Date: 25 Nov 1994 06:39:52 GMT

Organization: California Institute of Technology, Pasadena

Lines: 82

Message-ID: <[email protected]>

References: <[email protected]>

NNTP-Posting-Host: accord.cco.caltech.edu

In article <[email protected]>, Shawn Platkus <[email protected]> wrote:

>I'm in need of some code to read the joystick values from 65816 assembly.

This was sent to me a while back.

Nathan

--- Begin included file

From [email protected] Sat Mar 27 21:47:15 1993

From: [email protected]

X-Mailer: America Online Mailer

To: [email protected]

Subject: joystick routine

Path: Assembly (6502/65816)/Asm65816 Code Wanted...

Subj: My code... 92-10-21 22:48:08 EST

>From: AFL GaryJ

Posted on: America Online

Here's the code I used. There are a few things to keep in mind with this

code: Because I'm using wide registers, the X and Y values of the joystick

may come back with values greater than $FF. The size of the number returned

depends (in part) upon the speed of the machine that the code is running on.

Accellerated IIGS's will return greater values than stock 2.8 MHz machines.

Having the user do a joystick calibration at the start of the program would

be one way of solving this problem.

Also, because the maximum joystick value returned is not "clipped off" (i.e.

maxed out at $FF), the X and Y maximum returned values may differ, depending

on the model and wear of your joystick.

And one last thing: The timing cycles of my routine are greater than the sum

of the cycles required to execute the standard paddle reading routine built

into the II+ ROM. But, since my routine will execute at speeds greater than

1 MHz, the net difference results in a faster joystick read. That, coupled

with the fact that both paddles are read at the same time, makes this routine

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 233 of 572

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