Subject: Re: [stella] Trak-ball 3-kind From: Bob Colbert <retroware@xxxxxxxxxxxxx> Date: Thu, 04 Feb 1999 12:56:41 -0600 |
At 03:23 PM 2/4/99 +0100, you wrote: >At 16:11 03.02.99 -0800, you wrote: > >>Do you have the Black/Creme version? Which was factory designed for both >>computers/VCS Hi, I have tried the Black/Creme version under both the ST and Amiga settings on Stell-A-Sketch and it doesn't work under either. Let me give a quick explanation of how the trackball works: As we all know, the Atari Joystick has 4 directional buttons. The trackball uses these 4 connections to determine which direction the trackball is moving. It does this by sending out a series of joystick moves. I don't have the exact moves used, and they differ from platform to platform (Amiga is different from Atari ST is different from VCS). NC = NO CONNECTION, joystick at rest... Mouse moves left: Up NC Left Mouse moves right: Left NC Up Mouse moves up: Right NC Down Mouse moves down: Down NC Right Now these patterns are cyclical, meaning that the "Mouse moves down" example would work if the series "NC Right Down" was sent. Now let's pretend that the above example is true for the Amiga and for the Atari ST "Mouse moves down" is Left NC Right. Switching the wire inside the trackball that represents "Down" with the one that represents "Left" would make the "Mouse moves down" work for the Atari ST. So the point is that it is possible to modify these devices to work on a different platform very easily. I didn't have access to a Trackball when I wrote Stell-A-Sketch, so I didn't build compatability in (though it works in JS mode of course). It is a simple matter of using a different lookup table to get each device to work. Hope I haven't confused the heck out of you! Bob -- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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