Caple C871i Manual do Utilizador descarregar pdf (Página 230)

100

101

Apple II Computer Info

asm {

sep #0x30

lda n

and #0x03

tax

lda 0xE0C064,x

and #0x80

sta paddle_flag

rep #0x30

}

return (paddle_flag != 0);

}

Boolean read_button(Word n) {

/* Read the state of the specified paddle/joystick button. The return

value will be TRUE if the button is on, FALSE if the button

is off. This routine supports buttons 0, 1, 2, and 3. Button

3 is only available on the IIgs, and only on the internal 16-pin

game port.

Note: holding down the Apple key will make button 0 appear to

be on; similarly, the Option key will make button 1 appear to

be on. */

Byte button_state;

asm {

sep #0x30

lda n

inc a

and #0x03

tax

lda 0xE0C060,x

and #0x80

sta button_state

rep #0x30

}

return (button_state != 0);

}

David Empson

[email protected]

Snail mail: P.O. Box 27-103, Wellington, New Zealand

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### joystick.orca

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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 : 230 of 572

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