Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!watmath!clyde!rutgers!cbmvax!grr From: grr@cbmvax.UUCP Newsgroups: comp.sys.atari.st Subject: Re: (none) Message-ID: <1327@cbmvax.cbmvax.cbm.UUCP> Date: Mon, 2-Feb-87 05:07:17 EST Article-I.D.: cbmvax.1327 Posted: Mon Feb 2 05:07:17 1987 Date-Received: Tue, 3-Feb-87 02:26:36 EST References: <8702010036.AA24362@clutx.clarkson.edu> Reply-To: grr@cbmvax.UUCP (George Robbins) Organization: Commodore Technology, West Chester, PA Lines: 44 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)