{"id":17290,"date":"2025-11-24T21:24:54","date_gmt":"2025-11-24T20:24:54","guid":{"rendered":"https:\/\/www.bramjacobse.nl\/wordpress\/?p=17290"},"modified":"2025-11-24T21:58:43","modified_gmt":"2025-11-24T20:58:43","slug":"cd-100-servo-and-sub-code-cpu-rom-backup","status":"publish","type":"post","link":"https:\/\/www.bramjacobse.nl\/wordpress\/?p=17290","title":{"rendered":"CD 100 Servo and Sub-Code CPU ROM backups"},"content":{"rendered":"<p>Some time ago i had a development <span style=\"color: #3366ff;\"><a style=\"color: #3366ff;\" href=\"https:\/\/www.bramjacobse.nl\/wordpress\/?p=15905\">F 8421 Compact Disc Player Handmodel nr. 85<\/a><\/span> on my workbench , The player had two development MAB processors and ROMS chips , i made a backup copy&#8217;s of these ROM&#8217;s<\/p>\n<p>The MAB8400 Piggy back processor \u00a0with \u00a0E252 Firmware for the Servo.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-17288\" src=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/Servo_E252_CD100.jpeg\" alt=\"\" width=\"1280\" height=\"858\" srcset=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/Servo_E252_CD100.jpeg 1280w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/Servo_E252_CD100-720x483.jpeg 720w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/Servo_E252_CD100-520x349.jpeg 520w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/Servo_E252_CD100-320x215.jpeg 320w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/Servo_E252_CD100-300x201.jpeg 300w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/Servo_E252_CD100-768x515.jpeg 768w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/Servo_E252_CD100-800x536.jpeg 800w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p>The \u00a0MAB8400 Piggy back Processor with E536 Firmware for Subcode<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-17287\" src=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/F8421_nr85_E536_Subcode.jpeg\" alt=\"\" width=\"1280\" height=\"872\" srcset=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/F8421_nr85_E536_Subcode.jpeg 1280w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/F8421_nr85_E536_Subcode-720x491.jpeg 720w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/F8421_nr85_E536_Subcode-520x354.jpeg 520w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/F8421_nr85_E536_Subcode-320x218.jpeg 320w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/F8421_nr85_E536_Subcode-300x204.jpeg 300w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/F8421_nr85_E536_Subcode-768x523.jpeg 768w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/F8421_nr85_E536_Subcode-800x545.jpeg 800w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p>After some searching I found new and working MAB8400 piggyback processors ,I did not have the right eproms , after some \u00a0workarounds , \u00a0i could test the Rom copy&#8217;s<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-17285\" src=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/CD100_Test_Eprom_02.jpeg\" alt=\"\" width=\"1280\" height=\"960\" srcset=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/CD100_Test_Eprom_02.jpeg 1280w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/CD100_Test_Eprom_02-720x540.jpeg 720w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/CD100_Test_Eprom_02-520x390.jpeg 520w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/CD100_Test_Eprom_02-320x240.jpeg 320w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/CD100_Test_Eprom_02-300x225.jpeg 300w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/CD100_Test_Eprom_02-768x576.jpeg 768w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/CD100_Test_Eprom_02-800x600.jpeg 800w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p>Testing in a CD100\/30 Piggyback Servo and Subcode Processors with ROM copy&#8217;s<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-17286\" src=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/CD100_Test_Eprom01.jpeg\" alt=\"\" width=\"1280\" height=\"745\" srcset=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/CD100_Test_Eprom01.jpeg 1280w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/CD100_Test_Eprom01-720x419.jpeg 720w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/CD100_Test_Eprom01-520x303.jpeg 520w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/CD100_Test_Eprom01-320x186.jpeg 320w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/CD100_Test_Eprom01-300x175.jpeg 300w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/CD100_Test_Eprom01-768x447.jpeg 768w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/11\/CD100_Test_Eprom01-800x466.jpeg 800w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p>a backup is a backup if you could restore it: <span style=\"color: #3366ff;\"><a style=\"color: #3366ff;\" href=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2025\/05\/Yesyes2.mov\">Testing Copy roms in CD 100\/30<\/a><\/span><\/p>\n<p>&nbsp;<\/p>\n<p>In production CD 100 the Servo Processor can have the following firmware versions<\/p>\n<ul>\n<li>C006<\/li>\n<li>D011<\/li>\n<li>D023 in late CD100\/30 model and CD 101 only with B007 : Please read : \u00a0<span style=\"color: #3366ff;\"><a style=\"color: #3366ff;\" href=\"https:\/\/www.bramjacobse.nl\/wordpress\/?p=15259\">CD100 start delay after reading T.O.C.<\/a><\/span><\/li>\n<\/ul>\n<p>Movie showing difference in TOC reading and \u00a0acces speed , on the left CD 100 with D011 vs on the right CD 100 with \u00a0D023 firmware : <span style=\"color: #3366ff;\"><a style=\"color: #3366ff;\" href=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2023\/12\/CD100_D11_D23.mov\">CD100 D011 versus D023<\/a><\/span><\/p>\n<p>In production CD 100 the subcode Processor \u00a0can have different firmware versions<\/p>\n<ul>\n<li>B002<\/li>\n<li>B007 this version has Absolute and Track time, used in de CD 202 and CD 303 and Late CD100\/30<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>I also recieved photo&#8217;s of <span style=\"color: #3366ff;\"><a style=\"color: #3366ff;\" title=\"Permalink to F 8421 Compact Disc Player Handmodel nr. 394\" href=\"https:\/\/www.bramjacobse.nl\/wordpress\/?p=13274\" rel=\"bookmark\">F 8421 Compact Disc Player Handmodel nr. 394<\/a><\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-13271\" src=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/04\/CD-F8421_19.jpg\" alt=\"\" width=\"1280\" height=\"960\" srcset=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/04\/CD-F8421_19.jpg?v=1712035949 1280w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/04\/CD-F8421_19-300x225.jpg?v=1712035949 300w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/04\/CD-F8421_19-800x600.jpg?v=1712035949 800w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/04\/CD-F8421_19-768x576.jpg?v=1712035949 768w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/04\/CD-F8421_19-720x540.jpg?v=1712035949 720w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/04\/CD-F8421_19-520x390.jpg?v=1712035949 520w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/04\/CD-F8421_19-320x240.jpg?v=1712035949 320w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-13267\" src=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/04\/CD-F8421_15.jpg\" alt=\"\" width=\"1280\" height=\"960\" srcset=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/04\/CD-F8421_15.jpg?v=1712035949 1280w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/04\/CD-F8421_15-300x225.jpg?v=1712035949 300w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/04\/CD-F8421_15-800x600.jpg?v=1712035949 800w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/04\/CD-F8421_15-768x576.jpg?v=1712035949 768w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/04\/CD-F8421_15-720x540.jpg?v=1712035949 720w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/04\/CD-F8421_15-520x390.jpg?v=1712035949 520w, https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/04\/CD-F8421_15-320x240.jpg?v=1712035949 320w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Some time ago i had a development F 8421 Compact Disc Player Handmodel nr. 85 on my workbench , The player had two development MAB processors and ROMS chips , i made a backup&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":17288,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[69,111,83,81,249],"tags":[],"class_list":["post-17290","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cd-100","category-cd-101","category-cd-200","category-cd-300","category-f-8421"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>CD 100 Servo and Sub-Code CPU ROM backups - Bram Jacobse<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.bramjacobse.nl\/wordpress\/?p=17290\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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