{"id":9777,"date":"2022-05-16T17:43:53","date_gmt":"2022-05-16T16:43:53","guid":{"rendered":"http:\/\/www.intexsound.de\/Commodore-Museum-Mannheim\/?p=9777"},"modified":"2025-01-25T15:43:35","modified_gmt":"2025-01-25T14:43:35","slug":"9777","status":"publish","type":"post","link":"https:\/\/www.intexsound.de\/Commodore-Museum-Mannheim\/2022\/05\/16\/9777\/","title":{"rendered":"A2091 rev 4"},"content":{"rendered":"<div class=\"expheader\">\n<div class=\"title\">\n<p><strong>A2091 rev 4<\/strong><\/p>\n<\/div>\n<\/div>\n<table class=\"basedata\">\n<tbody>\n<tr valign=\"top\">\n<td>\n<div class=\"th\">Company<\/div>\n<p>Commodore, USA<\/td>\n<td>\n<div class=\"th\">Date<\/div>\n<p>1991<\/td>\n<td nowrap=\"nowrap\">\n<div class=\"th\">Amiga<\/div>\n<p>A2000, A3000, A4000<\/td>\n<td nowrap=\"nowrap\">\n<div class=\"th\">Interface<\/div>\n<p>Zorro II<\/td>\n<td nowrap=\"nowrap\">\n<div class=\"th\">Autoconfig ID<\/div>\n<p>514 \/ 2,3,10<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div class=\"description\">\n<p><i>SCSI controller<\/i><\/p>\n<ul>\n<li>Western Digital 33C93<\/li>\n<li>uses the same DMAC custom chip for DMA transfers as the A3000<\/li>\n<li>knows the Rigid Disk Block and SCSI Direct protocols<\/li>\n<li>built in XT IDE (8 bit) hard disk controller &#8211; the connectors and LED are not installed but their place is visible on the card<\/li>\n<li>50 pin internal SCSI header<\/li>\n<li>DB25 external connector<\/li>\n<li>a 3.5&#8243; hard disk can be mounted on the card<\/li>\n<li>16 kB autoboot ROM (can be disabled) &#8211; autobooting requires at least Kickstart 1.3\n<ul>\n<li>revision 7.0 of the ROM is necessary for 68040 machines<\/li>\n<\/ul>\n<\/li>\n<li>supports SCSI network sharing<\/li>\n<li>supported by Linux, NetBSD and OpenBSD<\/li>\n<li>A-Max II driver (scsi.amhd)<\/li>\n<\/ul>\n<p><i>memory<\/i><\/p>\n<ul>\n<li>sixteen DIP sockets accept 0.5, 1 or 2 MB RAM<\/li>\n<li>supports 256k\u00d74 (44256) chips, 120 ns or faster<\/li>\n<li>cannot use DMA to transfer data to 32 bit fast RAM<\/li>\n<li>if Zorro II DMA memory is not available the driver falls back to programmed I\/O transfers<\/li>\n<li>performs extremely slow in the A4000 because of the above mentioned two problems<\/li>\n<\/ul>\n<p>recapped with Rubycon brand 105\u00b0 type<\/p>\n<p><a href=\"https:\/\/www.intexsound.de\/Commodore-Museum-Mannheim\/hegatad\/uploads\/2025\/01\/A2091-rev4-ROMs-7.0.zip\">original ROMs<\/a><br \/>\n<a href=\"https:\/\/www.intexsound.de\/Commodore-Museum-Mannheim\/hegatad\/uploads\/2024\/02\/A2091-DI.zip\">drivers &amp; installation<\/a><\/p>\n\n\t\t<style type=\"text\/css\">\n\t\t\t#gallery-1 {\n\t\t\t\tmargin: auto;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-item {\n\t\t\t\tfloat: left;\n\t\t\t\tmargin-top: 10px;\n\t\t\t\ttext-align: center;\n\t\t\t\twidth: 33%;\n\t\t\t}\n\t\t\t#gallery-1 img {\n\t\t\t\tborder: 2px solid #cfcfcf;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-caption {\n\t\t\t\tmargin-left: 0;\n\t\t\t}\n\t\t\t\/* see gallery_shortcode() in wp-includes\/media.php *\/\n\t\t<\/style>\n\t\t<div data-carousel-extra='{\"blog_id\":1,\"permalink\":\"https:\\\/\\\/www.intexsound.de\\\/Commodore-Museum-Mannheim\\\/2022\\\/05\\\/16\\\/9777\\\/\",\"likes_blog_id\":false}' id='gallery-1' class='gallery galleryid-9777 gallery-columns-3 gallery-size-thumbnail'><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/www.intexsound.de\/Commodore-Museum-Mannheim\/2022\/05\/16\/9777\/20220516_174110\/#main'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.intexsound.de\/Commodore-Museum-Mannheim\/hegatad\/uploads\/2022\/05\/20220516_174110-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" data-attachment-id=\"9778\" data-orig-file=\"https:\/\/www.intexsound.de\/Commodore-Museum-Mannheim\/hegatad\/uploads\/2022\/05\/20220516_174110-scaled.jpg\" data-orig-size=\"2560,1440\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;2.4&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;SM-G965F&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;1652722870&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;6&quot;,&quot;iso&quot;:&quot;100&quot;,&quot;shutter_speed&quot;:&quot;0.03030303030303&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;,&quot;keywords&quot;:&quot;Array&quot;}\" data-image-title=\"20220516_174110\" data-image-description=\"\" data-medium-file=\"https:\/\/www.intexsound.de\/Commodore-Museum-Mannheim\/hegatad\/uploads\/2022\/05\/20220516_174110-300x169.jpg\" data-large-file=\"https:\/\/www.intexsound.de\/Commodore-Museum-Mannheim\/hegatad\/uploads\/2022\/05\/20220516_174110-1024x576.jpg\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/www.intexsound.de\/Commodore-Museum-Mannheim\/2022\/05\/16\/9777\/20220516_174711\/#main'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.intexsound.de\/Commodore-Museum-Mannheim\/hegatad\/uploads\/2022\/05\/20220516_174711-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" data-attachment-id=\"9779\" data-orig-file=\"https:\/\/www.intexsound.de\/Commodore-Museum-Mannheim\/hegatad\/uploads\/2022\/05\/20220516_174711-scaled.jpg\" data-orig-size=\"2560,1440\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;2.4&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;SM-G965F&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;1652723231&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;6&quot;,&quot;iso&quot;:&quot;160&quot;,&quot;shutter_speed&quot;:&quot;0.03030303030303&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;,&quot;keywords&quot;:&quot;Array&quot;}\" data-image-title=\"20220516_174711\" data-image-description=\"\" data-medium-file=\"https:\/\/www.intexsound.de\/Commodore-Museum-Mannheim\/hegatad\/uploads\/2022\/05\/20220516_174711-300x169.jpg\" data-large-file=\"https:\/\/www.intexsound.de\/Commodore-Museum-Mannheim\/hegatad\/uploads\/2022\/05\/20220516_174711-1024x576.jpg\" \/><\/a>\n\t\t\t<\/dt><\/dl>\n\t\t\t<br style='clear: both' \/>\n\t\t<\/div>\n\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>A2091 rev 4 Company Commodore, USA Date 1991 Amiga A2000, A3000, A4000 Interface Zorro II Autoconfig ID 514 \/ 2,3,10 SCSI controller Western Digital 33C93 uses the same DMAC custom chip for DMA transfers as the A3000 knows the Rigid Disk Block and SCSI Direct protocols built in XT IDE (8 bit) hard disk controller [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":9778,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"cybocfi_hide_featured_image":"","footnotes":"","_links_to":"","_links_to_target":""},"categories":[54],"tags":[],"class_list":["post-9777","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-amiga-zorro-cards"],"_links":{"self":[{"href":"https:\/\/www.intexsound.de\/Commodore-Museum-Mannheim\/wp-json\/wp\/v2\/posts\/9777","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.intexsound.de\/Commodore-Museum-Mannheim\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.intexsound.de\/Commodore-Museum-Mannheim\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.intexsound.de\/Commodore-Museum-Mannheim\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.intexsound.de\/Commodore-Museum-Mannheim\/wp-json\/wp\/v2\/comments?post=9777"}],"version-history":[{"count":0,"href":"https:\/\/www.intexsound.de\/Commodore-Museum-Mannheim\/wp-json\/wp\/v2\/posts\/9777\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.intexsound.de\/Commodore-Museum-Mannheim\/wp-json\/wp\/v2\/media\/9778"}],"wp:attachment":[{"href":"https:\/\/www.intexsound.de\/Commodore-Museum-Mannheim\/wp-json\/wp\/v2\/media?parent=9777"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.intexsound.de\/Commodore-Museum-Mannheim\/wp-json\/wp\/v2\/categories?post=9777"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.intexsound.de\/Commodore-Museum-Mannheim\/wp-json\/wp\/v2\/tags?post=9777"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}