Caple C871i Manual do Utilizador descarregar pdf (Página 222)

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Apple II Computer Info

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### FILE : joystick.asm

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

### File Type: "TEXT" File Creator: "LMAN"

### File Size: 2466 bytes 2 KB

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From: [email protected] (Orion Pax)

Newsgroups: comp.sys.apple2.programmer

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

Date: 26 Nov 1994 06:32:24 GMT

Organization: Creative 'Ware @ University of California, Irvine

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Shawn Platkus ([email protected]) wrote:

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

Here's the code I copied from Out of This World and used in Star Command GS:

readJoystick START

* Reads the values for the joystick paddles && returns values in the x/y regs

* 7/93 version 4.0.2

* Code from Out of This World by Bill Heineman

php ; save states of cpu

phd

pea $100 ; put maxReadBound on stack (values max at $FF)

tsc ; point dp to maxReadBound

tcd

sei ; interrupts off

lda >$C070 ; reset joystick i/o timer

ldx #0 ; zero counters

txy

readLup anop

lda >$C064 ; read x/y axises

and #$8080

beq quit ; if neither valid, quit

checkY anop

asl a

bcc ySpinWheels ; if invalid y, do dummy code for dummy cycle time

iny ; else increment y counter

bra checkX

ySpinWheels anop ; dummy code of similiar cycle time

nop

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 222 of 572

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Caple C871i Manual do Utilizador Página 222

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