[stella] Emulating the trakball controller

[SeaGtGruff at aol.com]

In a message dated 1/4/2007 8:56:14 PM Eastern Standard Time,  
ericball at atariage.com writes:

As per  http://www.atariage.com/forums/index.php?showtopic=88663 the CX80 is  
basically two driving controllers i.e. gray code  sequence
00<-->01<-->11<-->10<-->00
while the  CX22 uses one bit for direction and the other for clock.  I think 
one  (both?) of the trackballs also had a "joystick  mode".



As it happens, last weekend I recovered my old Atari Trak-Ball (CX22) from  
my parents' storage shed, and I was just about to tell you that I looked at it  
carefully and could find *no* switch on it for switching between two modes of 
 operation-- but I just looked again, and hidden underneath the lower left 
corner  *is* a switch for selecting "Joystick" or "Trak Ball" mode. Man, I think 
I need  to take this thing apart and clean it, oil it, or do whatever you do 
to keep it  in good working order. I haven't actually tried playing anything 
like Millipede  with it yet, but it makes a lot of squeaking noises, and 
doesn't roll very well  in the SW direction.
 
I also recovered my old Atari Touch Tablet (CX77), which-- if I remember  
correctly-- is read just like a pair of paddles? I think it would be cool to  
write a paint program for the Atari 2600 that uses the Touch Tablet! :)
 
Michael
 
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