I seem to remember being told that with the interrupt chip on x86, one of
those interrupts or the mask was flaky/trigger happy.
>________________________________
> From: Christoph Nuscheler <christoph.nusche...@t-online.de>
>To: freedos-devel@lists.sourceforge.net
>Sent: Tuesday, March 25, 2014 2:59 AM
>Subject: [Freedos-devel] Weird behaviour of "legacy USB" trackball
>
>
>Hello,
>
>I'm writing straight away to the development list, because I think I'll
>have to do some coding to fix my problem:
>
>My system is a Pentium MMX PC/104 board. Its BIOS does a pretty good job
>in providing PS/2 access to USB keyboards and mice in DOS. For example,
>a wireless KeySonic ACK-540RF keyboard/touchpad combo works absolutely
>flawlessly using CuteMouse.
>
>However, connecting the Ortek PKB-1760 wireless keyboard/trackball combo
>to the system causes problems: CuteMouse recognizes the PS/2 mouse
>without issues, but the behaviour is totally off:
>Horizontal motion (X) of the trackball moves the cursor vertically (Y).
>Vertical motion (Y) of the trackball does nothing.
>Clicking the buttons stepwise moves the cursor to the right (+X).
>The touch scroll bar does nothing. (It doesn't need to, anyway.)
>
>Note: I tried several if not all of the command line switches. Also I
>ran the original Microsoft and Logitech mouse drivers which produced the
>same result.
>
>So I suspect, instead of the normal PS/2 protocol sequence:
>
> 1st byte 2nd byte 3rd byte
> +---------------+ +---------------+ +---------------+
> |?|?|Y|X|1|M|R|L| |X|X|X|X|X|X|X|X| |Y|Y|Y|Y|Y|Y|Y|Y|
> +---------------+ +---------------+ +---------------+
>
>the trackball produces something non-standard like this:
>
> 1st byte 2nd byte 3rd byte 4th byte
>+---------------+ +---------------+ +---------------+ +---------------+
>|?|?|?|?|?|?|?|?| |?|?|Y|X|1|M|R|L| |X|X|X|X|X|X|X|X| |Y|Y|Y|Y|Y|Y|Y|Y|
>+---------------++---------------+ +---------------+ +---------------+
>
>
>What I want to try out: Modify the CuteMouse source code so it discards
>the first byte, and reads a fourth byte from PS/2.
>
>I already got my JWasm set up to build CuteMouse. I claim to know my way
>around X86 assembly, but reading and comprehending someone other's code
>is a different story. ;-)
>
>I would be grateful for any hints in modifying the PS/2 routines in
>CuteMouse.
>
>Thanks,
>
>Christoph
>
>
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