{"id":17712,"date":"2017-08-07T16:52:11","date_gmt":"2017-08-07T20:52:11","guid":{"rendered":"http:\/\/www.megalextoria.com\/wordpress\/?p=17712"},"modified":"2017-08-14T08:51:32","modified_gmt":"2017-08-14T12:51:32","slug":"trs-80-model-4-1984","status":"publish","type":"post","link":"https:\/\/www.megalextoria.com\/wordpress\/index.php\/2017\/08\/07\/trs-80-model-4-1984\/","title":{"rendered":"TRS-80 Model 4 (1984)"},"content":{"rendered":"<p><a href=\"http:\/\/darth-azrael.tumblr.com\/post\/163463241442\/thegikitiki-detail-from-1984-advertisement-for\"><img decoding=\"async\" class=\"alignnone size-full\" src=\"https:\/\/www.megalextoria.com\/wordpress\/wp-content\/uploads\/2017\/08\/tumblr_ocmdxmZzYv1tsaeqzo1_1280.png\" alt=\"\" \/><\/a><\/p>\n<p>Detail from\u00a0<i><b>1984\u00a0<\/b><\/i>Advertisement for the\u00a0<i><b>TRS-80 Model 4 Computer<\/b><\/i><\/p>\n<p><a href=\"http:\/\/darth-azrael.tumblr.com\/post\/163463241442\/thegikitiki-detail-from-1984-advertisement-for\">http:\/\/darth-azrael.tumblr.com\/post\/163463241442\/thegikitiki-detail-from-1984-advertisement-for<\/a><\/p>\n<p>Radio Shack released the TRS-80 Model 4 as a follow-up to the Model III three years later in 1983. It looked essentially the same as the Model III except that it was an off-white color instead of grey\/silver. Internally, there were some fairly significant upgrades, including:<\/p>\n<ul>\n<li>CPU: Z80A @ 4 MHz (compared to the ~2 MHz model III)<\/li>\n<li>Display: 80&#215;24 (compared to the 64 columns of the Model III)<\/li>\n<li>Available 64KB model (Upgradeable to 128KB of RAM)<\/li>\n<li>Full support for CP\/M without modification<\/li>\n<\/ul>\n<p><a href=\"https:\/\/file.army\/i\/Imfr5H\" rel=\"nofollow noopener\"><img decoding=\"async\" src=\"https:\/\/steemitimages.com\/0x0\/https:\/\/404store.com\/2017\/08\/07\/103672tandy-trs-80-model4.system.jpg\" \/><\/a><\/p>\n<p>It also included an expanded keyboard and TRSDOS 6. For this version of TRSDOS, Radio Shack contracted with the maker of LS-DOS\/LDOS, a popular and generally more capable 3rd party DOS produced for the TRS-80 line. They continued to market LS-DOS separately but it and TRSDOS were now essentially the same. The Model 4 was also 100% compatible with the Model III whereas the III had some incompatibilities with the original TRS-80.<\/p>\n<p><a href=\"https:\/\/file.army\/i\/ImfWHj\" rel=\"nofollow noopener\"><img decoding=\"async\" src=\"https:\/\/steemitimages.com\/0x0\/https:\/\/404store.com\/2017\/08\/07\/m4inside.jpg\" \/><\/a><\/p>\n<p>The following configurations were available:<\/p>\n<ul>\n<li>A diskless version with 16KB RAM (cassette only): $999<\/li>\n<li>A single disk version (180K single sided, double density) with 64KB RAM: $1699<\/li>\n<li>A dual disk version with 64KB RAM: $1999<\/li>\n<\/ul>\n<p><a href=\"https:\/\/file.army\/i\/ImfoFv\" rel=\"nofollow noopener\"><img decoding=\"async\" src=\"https:\/\/steemitimages.com\/0x0\/https:\/\/404store.com\/2017\/08\/07\/m4board.jpg\" \/><\/a><\/p>\n<p>There was also an upgrade available for Model IIIs that essentially turned it into a Model 4. It included a new motherboard and keyboard and cost $799.<\/p>\n<p>The Model 4 was the last major revision the the TRS-80 line though there would be a somewhat enhanced Model 4D released in 1985 that would be sold through at least 1991.<\/p>\n<p><a href=\"https:\/\/file.army\/i\/ImfwOs\" rel=\"nofollow noopener\"><img decoding=\"async\" src=\"https:\/\/steemitimages.com\/0x0\/https:\/\/404store.com\/2017\/08\/07\/m4fdcser.jpg\" \/><\/a><\/p>\n<p>As I mentioned in a previous post, my high school still had TRS-80 Model IIs and 4s in 1989-1990 that were used for programming (BASIC) classes. I&#8217;m not sure how much longer they were there though I think they were being used at least one more year after that and possibly longer.<\/p>\n<p><center><br \/>\n<script type=\"text\/javascript\" src='http:\/\/adn.ebay.com\/files\/js\/min\/jquery-1.6.2-min.js'><\/script><br \/>\n<script type=\"text\/javascript\" src='http:\/\/adn.ebay.com\/files\/js\/min\/ebay_activeContent-min.js'><\/script><br \/>\n<script charset=\"utf-8\" type=\"text\/javascript\">\ndocument.write('\\x3Cscript type=\"text\/javascript\" charset=\"utf-8\" src=\"http:\/\/adn.ebay.com\/cb?programId=15&campId=5337952703&toolId=10026&keyword=TRS-80&width=560&height=400&font=1&textColor=000000&linkColor=0000AA&arrowColor=8BBC01&color1=709AEE&color2=[COLORTWO]&format=ImageLink&contentType=TEXT_AND_IMAGE&enableSearch=y&usePopularSearches=n&freeShipping=n&topRatedSeller=n&itemsWithPayPal=n&descriptionSearch=n&showKwCatLink=n&excludeCatId=&excludeKeyword=&catId=&disWithin=200&ctx=n&autoscroll=n&title=TRS-80&flashEnabled=' + isFlashEnabled + '&pageTitle=' + _epn__pageTitle + '&cachebuster=' + (Math.floor(Math.random() * 10000000 )) + '\">\\x3C\/script>' );\n<\/script><\/center><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Detail from\u00a01984\u00a0Advertisement for the\u00a0TRS-80 Model 4 Computer http:\/\/darth-azrael.tumblr.com\/post\/163463241442\/thegikitiki-detail-from-1984-advertisement-for Radio Shack released the TRS-80 Model 4 as a follow-up to the Model III three years later in 1983. It looked essentially the same as the Model III except that it was an off-white color instead of grey\/silver. Internally, there were some fairly significant upgrades, including: CPU: Z80A @ 4 MHz (compared to the ~2 MHz model III) Display: 80&#215;24 (compared to the 64 columns of the Model III) Available 64KB model (Upgradeable to 128KB of RAM) Full support for CP\/M without modification It also included an expanded keyboard and TRSDOS 6. For this version of TRSDOS, Radio Shack contracted with the maker of LS-DOS\/LDOS, a popular and generally more capable 3rd party DOS produced for the TRS-80 line. They continued to market LS-DOS separately but it and TRSDOS were now essentially the same. The Model 4 was also 100% compatible with the Model III whereas the III had some incompatibilities with the original TRS-80. The following configurations were available: A diskless version with 16KB RAM (cassette only): $999 A single disk version (180K single sided, double density) with 64KB RAM: $1699 A dual disk version with 64KB RAM: $1999 There was [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,30],"tags":[65,1415,1833,2837,2486],"class_list":["post-17712","post","type-post","status-publish","format-standard","hentry","category-computer-arcana","category-trs-80","tag-65","tag-radio-shack","tag-trs-80","tag-trs-80-model-4","tag-trs80"],"_links":{"self":[{"href":"https:\/\/www.megalextoria.com\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/17712","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.megalextoria.com\/wordpress\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.megalextoria.com\/wordpress\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.megalextoria.com\/wordpress\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.megalextoria.com\/wordpress\/index.php\/wp-json\/wp\/v2\/comments?post=17712"}],"version-history":[{"count":0,"href":"https:\/\/www.megalextoria.com\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/17712\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.megalextoria.com\/wordpress\/index.php\/wp-json\/wp\/v2\/media?parent=17712"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.megalextoria.com\/wordpress\/index.php\/wp-json\/wp\/v2\/categories?post=17712"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.megalextoria.com\/wordpress\/index.php\/wp-json\/wp\/v2\/tags?post=17712"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}