{"id":3322,"date":"2025-04-18T04:53:29","date_gmt":"2025-04-18T04:53:29","guid":{"rendered":"https:\/\/webprojects.cloud\/wordpress\/splatco\/?post_type=spl_knowledgebase&#038;p=3322"},"modified":"2025-06-10T09:25:45","modified_gmt":"2025-06-10T09:25:45","slug":"multi-channel-multitrack-branchj","status":"publish","type":"spl_knowledgebase","link":"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/tutorial-multitrack\/multitrack-advanced-multi-channel-operations\/multi-channel-multitrack-branchj\/","title":{"rendered":"Multi-channel MultiTrack: BranchJ"},"content":{"rendered":"\n<p>Although J is automatically applied to all memory reference and I\/O instructions inside a MultiTrack task (unless you use&nbsp;<code>NoJ:<\/code>), there may be occasions when the automatic behaviour is not what you need. The&nbsp;<code>BranchJ<\/code>&nbsp;instructions gives you an open ended way of forcing exactly what you need to happen.<\/p>\n\n\n\n<p><code>BranchJ<\/code>&nbsp;works in a similar way to the other&nbsp;<code>Branch<\/code>&nbsp;instructions (<code><a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/programming-reference\/instructions-arranged-by-function\/goto-gosub-and-related-instructions\/branch\/\">Branch<\/a>, <a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/programming-reference\/instructions-arranged-by-function\/goto-gosub-and-related-instructions\/branchm-mm\/\">BranchM<\/a>, <a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/programming-reference\/instructions-arranged-by-function\/goto-gosub-and-related-instructions\/branchr\/\">BranchR<\/a><\/code>). It gives you an &#8220;n-way branch&#8221; depending on the value of J.<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">Example:<\/h6>\n\n\n\n<p>In this (really exciting! : -) version of our on\/off light switch, the order of the outputs is reversed relative to the inputs, i.e. input 0 controls output 3, 1 controls 2, 2 controls 3 and 3 controls 0.<\/p>\n\n\n\n<p><a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/cutting-and-pasting-code-from-the-splat-knowledge-base\/\">(Click here<\/a>&nbsp;for some tips for working around problems with copy and paste out of Internet Explorer and HTML-help&nbsp;<code>(.chm)<\/code>&nbsp;files)<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">        LaunchTask      Toggle,0<br>        LaunchTask      Toggle,1<br>        LaunchTask      Toggle,2<br>        LaunchTask      Toggle,3<br>        RunTasksForever<br>Toggle:<br>        WaitOnK         0<br>        GoSub           Reverse<br>        iOn             0<br>        WaitOnK         0<br>        GoSub           Reverse<br>        iOff            0<br>        GoTo            Toggle<br><br>Reverse:<br>        LoadI           3<br>        BranchJ<br>        Target          J0<br>        Target          J1<br>        Target          J2<br>        Target          J3<br><br>J3:<br>       DecI<br>J2:<br>       DecI<br>J1:<br>       DecI<br>J0:<br>       Return<\/pre>\n\n\n\n<h6 class=\"wp-block-heading\">Exercise 1:<\/h6>\n\n\n\n<p>Analyze how the program works.<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">Exercise 2:<\/h6>\n\n\n\n<p>What happens if you change the&nbsp;<code>iOn<\/code>&nbsp;and&nbsp;<code>iOff<\/code>&nbsp;instructions with&nbsp;<code>IasJ:On<\/code>&nbsp;and&nbsp;<code>IasJ:Off<\/code>&nbsp;respectively?<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">Exercise 3:<\/h6>\n\n\n\n<p>Rewrite the&nbsp;<code>Reverse<\/code>&nbsp;subroutine for the following mapping, not using a chain of&nbsp;<code>DecI<\/code>&nbsp;instructions. Do use the&nbsp;<code>BranchJ<\/code>&nbsp;instruction.:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>Input<\/th><th>Output<\/th><\/tr><tr><td>0<\/td><td>1<\/td><\/tr><tr><td>1<\/td><td>6<\/td><\/tr><tr><td>2<\/td><td>7<\/td><\/tr><tr><td>3<\/td><td>0<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Although J is automatically applied to all memory reference and I\/O instructions inside a MultiTrack task (unless you use&nbsp;NoJ:), there may be occasions when the&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":3317,"menu_order":4,"template":"","class_list":["post-3322","spl_knowledgebase","type-spl_knowledgebase","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Multi-channel MultiTrack: BranchJ - SPLat Controls<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Multi-channel MultiTrack: BranchJ - 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