🚀 go-pugleaf

In article <8702010036.AA24362@clutx.clarkson.edu> l40a@clutx.BITNET (Michael DeCorte) writes:
> 
>1) there have been some questions about using a trackball or joystick
>   with the atari-st.  If you put a joystick into the mouse port it
>   will work but not correctly.  The mouse seems to send pulses
>   while the joystick sends a continuous signal therefore to make
>   the joystick work you have to push the joystick in the desired
>   direction once for each pixel.  As the wico trackball tries to
>   imitate a joystick it is not very useful.  Note it may be possible
>   to make the trackball work by ripping out the circuitry that
>   converts the trackball output (I believe it is identical to
>   a mouse output).
> 
>michael decorte >l40a@clutx.bitnet

Article <259@esunix.uucp> in comp.sys.amiga describes how to convert WICO
and Atari 2600 track balls to work with the Amiga.  Converting for the
Atari ST is essentially the same, except for some disagreement between
Atari and CBM on which quadrature signals go to which "joystick" line.

Pin	Amiaga			Atari
1	Vertical		X-B
2	Horizontal		X-A
3	Vertical-Quatrature	Y-A
4	Horizontal-Quadrature	Y-B
5	Pot X			N.C.
6	Left Button		Left Button
7	+5V			+5V	
8	Ground			Ground
9	Pot Y-Right Button	Right Button

As you can see, the pin-outs are compatible enough that no harm will result
if the two are interchanged, however since the quadrature outputs don't
match up you will get pointless twitching instead of useful motion.  Simply
switch the wires going to pins 1 thru 4 until you get it right.

A minor problem is that the WICO trackballs are discontinued, so unless you
already know where to find one, you may have problems.

If someone wants, I can repost the original article...
-- 
George Robbins - now working for,	uucp: {ihnp4|seismo|rutgers}!cbmvax!grr
but no way officially representing	arpa: cbmvax!grr@seismo.css.GOV
Commodore, Engineering Department	fone: 215-431-9255 (only by moonlite)