Re: [PATCH] m68k: Fix atarimouse init

[Andreas Schwab <schwab@suse.de>]

Michael Schmitz <schmitz@biophys.uni-duesseldorf.de> writes:

> Hi Geert,
>
>> The kernel says (ARAnyM, windowed mode):
>> | Reseting weird mouse packet: 942, 379, 0
>> | Reseting weird mouse packet: 943, 379, 0
>> | Reseting weird mouse packet: 945, 378, 0
>> | Reseting weird mouse packet: 948, 378, 0
>> | Reseting weird mouse packet: 956, 376, 0

These messages come from ARAnyM.

>> 
>> When running X under ARAnyM (depth 16), some shortcomings show up:
>>   - up and down are interchanged (works fine when rolling the mouse over the
>>     bottom surface of the table --- old arabic map style ;-)
>
> Weird - the inversion of the y direction increment is taken from the old 
> busmouse driver code where it used to work OK. The point of reference is set to 
> be at the top of the 'screen' so moving the mouse down ought to generate 
> positive increments.

ARAnyM's emulation of the IKBD does not support changing the y origin.

>>   - the left and right mouse button are interchanged
>
> The busmouse driver had no annotation as to the semantics of the buttons so O 
> guessed bit 0 was for the left button. Guessed wrong, it seems.

Note that the mouse button bits are also inverted, ie. 0 means down.

>>   - the middle mouse button is dead
>
> As is expexcted - the original code was for a two-button mouse only. If Petr 
> knows what the ikbd format for the third button is (on real hardware) it's easy 
> to add that in.

The IKBD does not support more than two buttons.  For a three button
mouse the middle button was apparently wired to the joystick port.

See also <http://dev-docs.atariforge.org/files/ikbd_Prot_2-26-1985.pdf>.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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