Caple C871i Manuel d'utilisateur télécharger pdf (Page 179)

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101

Apple II Computer Info

LDA $CFFF ; switch off all extension ROMS

LDA $Cx00 ; switch on the extension ROM of the tablet

LDA #$Cx

STA $07F8 ; initialize some hidden text screen data area for the

tablet firmware

JSR $CBB9 ; call well known location ;-) in tablet firmware

When the pen is in reach of the tablet (up or down) this routine will

return immediatly. Else it will block - fortunatly the routine checks

the keyboard strobe ($C010) too and will also return if a key is

pressed, even if the pen remains out of tablets reach.

After the routine has returned one can get the information:

$0280 contains the state of the pen (up or down), I don't know excatly

any more wich bit it is nor if one can distiguish between 'pen up' and

'pen out of reach but key pressed'

$0281, $0282 contains the absolute X position of the pen

$0283, $0284 contains the absolute Y position of the pen

As far as I can remember the values have about 12 bit resolution (!).

Usually I needed screen coordinates (280 x 192), so I dropped the 4

least significant bits and did some additional adjustment.

Unfortunatly I can't remember either what coordinates will be there in

the 'out of reach but key pressed' case.

Hope this helps a little - if somebody has success using this method,

please give me some feedback.

BTW: I'm working on an Apple ][+ emulator, but suffer from a total

lack of infos about the Apple ][ mouse (I think it goes into slot 4

and uses some interrupt stuff ???) due to the fact that I have never

even seen such a mouse. Any way I'd like to build support for it into

my emulator. So what ports - what firmware - ... thanks for help in

advance.

Oliver

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Apple II Computer Technical Information : Apple II Family Hardware Info

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Caple C871i Manuel d'utilisateur Page 179

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Caple C871i Manuel d'utilisateur Page 179

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