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| From: Crown (all posts)
Date: 1999-03-22
Subject: RE: Lightpen
|
Hi,
> I just wrote the correct joystick and keyboard handling... :)
Hmmmm, the $fd30, $ff08 things you wrote about in some previous mails are common knowledge, so you are definitely not alone... :)
> > Lavina's picture shows there is nothing but a joy-port connection.
> > The program might be wrong then?
>
> Maybe it's for an other lightpen that uses user port.
Checking one of the programs I would say that this must be true....
(This was the demo one...) It has two routine's one was only catching the y-position, while the other was getting the X position by turning on and off each square... And it was watching bit 6 of
$ff0d, which has nothing to do with the joystick...
I think it works similar to the lightpen I have... Catching y position is easy, and when it has it, this cleared the screen to black, and a white stripe started to grow from the left of the screen in that line.
When he received the sygnal from the lightpen again it knew the x-position.... It was very slow to use, but it worked...
Tibor Biczo Crown of GOTU
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