![\"\"](\"https:\/\/pockemul.com\/wp-content\/uploads\/2024\/06\/image-4-1024x411.png\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/pockemul.com\/wp-content\/uploads\/2024\/06\/image-3.png\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/pockemul.com\/wp-content\/uploads\/2024\/06\/image-1-1024x448.png\")
<\/figure>\n\n\n\n\n\n\n\nMore than 10 years ago, I made a post on the Silicium <\/a>forum “Let’s not let the Sharp PC-1211 die” in which I explained the different ways to save the PC-1211 from its LCD disease. To summarize my thoughts, emulation is not possible without the ROM (I still hope one day to be able to recover the ROM by photography) and the simulation is really too complex to achieve a satisfactory result.<\/p>\n\n\n\n I have a simulator in my dev environment for many years but it is still far from perfect.<\/p>\n\n\n\n <\/p>\n\n\n\n Another idea that is on my mind would be to modify the ROM of a PC-1251 (the closest on a feature point of view), to restrict it and make it work like a pc-1211.<\/p> – We disassemble the ROM (easy) After investigation, this hybrid solution was too complex because documenting the PC-1251 ROM is a huge work and it is not close enough to the PC-1211 to serve as an easy starting point.<\/p>\n\n\n\n For the Casio PB-100, there is an extremely close model, the Elektronika MK-85, already emulated in PockEmul. <\/p>\n\n\n\n So I started using the PDP11 assembly language (the MK-85 CPU) to patch and enhance the original MK-85 ROM. <\/p>\n\n\n\n I’m thinking of calling it ‘The Almost PB-100<\/strong>‘.<\/p>\n\n\n\n It is a long journey to have a perfect PB-100 clone but the first shot is very promising and will be part of PockEmul 2.9.0.<\/p>\n\n\n\n Dear PockEmul fans, I don’t think anyone will contradict me when I point out the lack in PockEmul of 2 or 3 iconic machines from the history of pocket computers. The Sharp PC-1211 , the Casio FX-702p and the Casio PB-100 .<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[77,30,58,29],"tags":[],"class_list":["post-1853","post","type-post","status-publish","format-standard","hentry","category-almost-pb-100","category-casio","category-news","category-pockemullite"],"_links":{"self":[{"href":"https:\/\/pockemul.com\/index.php\/wp-json\/wp\/v2\/posts\/1853"}],"collection":[{"href":"https:\/\/pockemul.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pockemul.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pockemul.com\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/pockemul.com\/index.php\/wp-json\/wp\/v2\/comments?post=1853"}],"version-history":[{"count":7,"href":"https:\/\/pockemul.com\/index.php\/wp-json\/wp\/v2\/posts\/1853\/revisions"}],"predecessor-version":[{"id":1865,"href":"https:\/\/pockemul.com\/index.php\/wp-json\/wp\/v2\/posts\/1853\/revisions\/1865"}],"wp:attachment":[{"href":"https:\/\/pockemul.com\/index.php\/wp-json\/wp\/v2\/media?parent=1853"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pockemul.com\/index.php\/wp-json\/wp\/v2\/categories?post=1853"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pockemul.com\/index.php\/wp-json\/wp\/v2\/tags?post=1853"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
At the time replacement LCD screens were not yet available.<\/p>\n\n\n\n![\"\"](\"https:\/\/pockemul.com\/wp-content\/uploads\/2022\/09\/pc1211-1024x338.png\")
<\/figure>\n\n\n\nI introduced a 3rd hybrid way<\/h2>\n\n\n\n
– We document each LM instruction (not easy at all)
– We modify it (not so easy)
– we reassemble
– we integrate this into PockEmul<\/p><\/blockquote>\n\n\n\nThe Almost PB-100<\/h2>\n\n\n\n
In my opinion it is a more than 95% perfect clone.
Its ROM has been disassembled and documented<\/strong>. Piotr (Vintage programmable calculators (pisi.com.pl)<\/a>) has done an incredible work on this machine.<\/p>\n\n\n\n![\"\"](\"https:\/\/pockemul.com\/wp-content\/uploads\/2023\/04\/mk85-1024x442.jpg\")
<\/figure>\n\n\n\n
I am going to add functions, remove some commands specific to the MK-85 and modify some behaviors of the MK-85 to make it a perfect clone of the PB-100.<\/p>\n\n\n\n![\"\"](\"https:\/\/pockemul.com\/wp-content\/uploads\/2024\/06\/image-1024x589.png\")
<\/figure>\n\n\n\nPerfect emulation is an infinite quest. Please report us any inaccurate behaviour at contact@pockemul.com<\/a> <\/h2>\n","protected":false},"excerpt":{"rendered":"