{"id":3604,"date":"2014-09-20T20:01:51","date_gmt":"2014-09-20T18:01:51","guid":{"rendered":"http:\/\/www.kameli.net\/marq\/?p=3604"},"modified":"2014-09-20T20:01:51","modified_gmt":"2014-09-20T18:01:51","slug":"panasonic-memory-expansion","status":"publish","type":"post","link":"http:\/\/www.kameli.net\/marq\/?p=3604","title":{"rendered":"Panasonic memory expansion"},"content":{"rendered":"<p>A little project again: an 8k SRAM expansion for the JR-200. In the end, a rather simple exercise in address decoding with a GAL and wiring the expansion bus signals to the memory chip. Quite many wires there \u2013 was losing my hope at one point.<\/p>\n<p><a href=\"http:\/\/www.kameli.net\/marq\/wp-content\/uploads\/2014\/09\/panamem.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-thumbnail wp-image-3605\" alt=\"panamem\" src=\"http:\/\/www.kameli.net\/marq\/wp-content\/uploads\/2014\/09\/panamem-150x150.jpg\" width=\"150\" height=\"150\" \/><\/a>\u00a0<a href=\"http:\/\/www.kameli.net\/marq\/wp-content\/uploads\/2014\/09\/panamem.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-thumbnail wp-image-3606\" alt=\"panamem\" src=\"http:\/\/www.kameli.net\/marq\/wp-content\/uploads\/2014\/09\/panamem-150x150.png\" width=\"150\" height=\"150\" \/><\/a><\/p>\n<p>The kludge resides at $8000\u2013$9FFF, right after the standard RAM. You can load code there with <em>mload<\/em> and run it normally with <em>usr<\/em>. The BASIC is not aware of the extra mem, so after the boot you&#8217;ll just see the standard amount displayed. Further details such as the GAL function can be found on my dedicated <a href=\"http:\/\/www.kameli.net\/marq\/?page_id=1270\">JR-200 page<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A little project again: an 8k SRAM expansion for the JR-200. In the end, a rather simple exercise in address decoding with a GAL and wiring the expansion bus signals to the memory chip. Quite many wires there \u2013 was losing my hope at one point. \u00a0 The kludge resides at $8000\u2013$9FFF, right after the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,15],"tags":[],"class_list":["post-3604","post","type-post","status-publish","format-standard","hentry","category-laitteet","category-retro"],"_links":{"self":[{"href":"http:\/\/www.kameli.net\/marq\/index.php?rest_route=\/wp\/v2\/posts\/3604","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.kameli.net\/marq\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.kameli.net\/marq\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.kameli.net\/marq\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.kameli.net\/marq\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3604"}],"version-history":[{"count":1,"href":"http:\/\/www.kameli.net\/marq\/index.php?rest_route=\/wp\/v2\/posts\/3604\/revisions"}],"predecessor-version":[{"id":3607,"href":"http:\/\/www.kameli.net\/marq\/index.php?rest_route=\/wp\/v2\/posts\/3604\/revisions\/3607"}],"wp:attachment":[{"href":"http:\/\/www.kameli.net\/marq\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3604"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.kameli.net\/marq\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3604"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.kameli.net\/marq\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3604"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}