{"id":498,"date":"2018-10-16T00:13:55","date_gmt":"2018-10-16T00:13:55","guid":{"rendered":"http:\/\/tubetime.us\/?p=498"},"modified":"2018-10-16T00:13:55","modified_gmt":"2018-10-16T00:13:55","slug":"mpu-imc-clone","status":"publish","type":"post","link":"https:\/\/tubetime.us\/index.php\/2018\/10\/16\/mpu-imc-clone\/","title":{"rendered":"MPU-IMC Clone"},"content":{"rendered":"<p>Here&#8217;s another cloned card for your retro PC: may I present the MPU-IMC clone! (The what?)<\/p>\n<p>It&#8217;s a clone of an old card that Roland made for interfacing PS\/2 computers (MCA bus) with MIDI equipment like musical keyboards.<\/p>\n<p>Files may be found at <a href=\"https:\/\/github.com\/schlae\/mpu-imc\">GitHub<\/a>.<\/p>\n<p>Don&#8217;t get too excited though because it&#8217;s not complete. Well, the board layout and schematic are fine, but there are two chips on the board that are special.<\/p>\n<ul>\n<li>The\u00a0HD6801VD855P (Roland part number\u00a015179222) is a mask-ROM microcontroller that runs the entire card. I&#8217;m not aware of anyone who&#8217;s dumped the ROM, but maybe now there is an incentive to do so. \ud83d\ude09<\/li>\n<li>The\u00a0HG62E08R10FS (Roland part number\u00a015239133) is a gate array device. Think of a CPLD but these were &#8220;programmed&#8221; by customizing the top layer of metal during the IC fabrication process. Roland calls it the &#8220;Handshake controller&#8221; but nothing is known about the internal logic. If someone sacrifices a card and decaps this chip, a simple image of the top metal should be enough to deduce the functionality. There are rumors this chip is used on other Roland cards, but I am hesitate to say they are identical. I suspect Roland had various versions of this chip with different logic depending on the card and the computer&#8217;s bus. More work needs to be done.<\/li>\n<\/ul>\n<p>Anyway, I hope this is useful to someone out there!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Here&#8217;s another cloned card for your retro PC: may I present the MPU-IMC clone! (The what?) It&#8217;s a clone of an old card that Roland made for interfacing PS\/2 computers (MCA bus) with MIDI equipment like musical keyboards. Files may be found at GitHub. Don&#8217;t get too excited though because it&#8217;s not complete. Well, the [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"jetpack_publicize_message":"","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true},"categories":[5],"tags":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p80Z1r-82","_links":{"self":[{"href":"https:\/\/tubetime.us\/index.php\/wp-json\/wp\/v2\/posts\/498"}],"collection":[{"href":"https:\/\/tubetime.us\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tubetime.us\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tubetime.us\/index.php\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/tubetime.us\/index.php\/wp-json\/wp\/v2\/comments?post=498"}],"version-history":[{"count":1,"href":"https:\/\/tubetime.us\/index.php\/wp-json\/wp\/v2\/posts\/498\/revisions"}],"predecessor-version":[{"id":499,"href":"https:\/\/tubetime.us\/index.php\/wp-json\/wp\/v2\/posts\/498\/revisions\/499"}],"wp:attachment":[{"href":"https:\/\/tubetime.us\/index.php\/wp-json\/wp\/v2\/media?parent=498"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tubetime.us\/index.php\/wp-json\/wp\/v2\/categories?post=498"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tubetime.us\/index.php\/wp-json\/wp\/v2\/tags?post=498"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}