{"id":101,"date":"2022-01-31T11:54:20","date_gmt":"2022-01-31T14:54:20","guid":{"rendered":"http:\/\/www.computer.etc.br\/site\/?page_id=101"},"modified":"2022-01-31T16:26:31","modified_gmt":"2022-01-31T19:26:31","slug":"trs-80-model-iii","status":"publish","type":"post","link":"http:\/\/www.computer.etc.br\/site\/trs-80-model-iii\/","title":{"rendered":"1980 TRS-80 model III"},"content":{"rendered":"

The model 3 is generally regarded as the successor to the Model 1. Its two 5.25″ floppy disk drives could convert model 1 disks.<\/p>\n

Initially Radio Shack wanted to sell both the model 1 and 3 at the same time, but the FCC forced them to stop selling model 1. Is so they were discontinued because of the excessive radio noise that they put out.<\/p>\n

However, the Model 3 wasn’t FULLY compatible with the model 1. There were differences in ROM which meant some programs had to be converted, especially those machine language ones that made ROM calls.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
NAME\u00a0\u00a0<\/b><\/td>\nTRS 80 MODEL III<\/td>\n<\/tr>\n
MANUFACTURER\u00a0\u00a0<\/b><\/td>\nTandy Radio Shack<\/td>\n<\/tr>\n
TYPE\u00a0\u00a0<\/b><\/td>\nHome Computer<\/td>\n<\/tr>\n
ORIGIN\u00a0\u00a0<\/b><\/td>\nU.S.A.<\/td>\n<\/tr>\n
YEAR\u00a0\u00a0<\/b><\/td>\n1981<\/td>\n<\/tr>\n
END\u00a0OF\u00a0PRODUCTION\u00a0\u00a0<\/b><\/td>\nUnknown<\/td>\n<\/tr>\n
BUILT\u00a0IN\u00a0LANGUAGE\u00a0\u00a0<\/b><\/td>\nTRS-80 Level II BASIC<\/td>\n<\/tr>\n
KEYBOARD\u00a0\u00a0<\/b><\/td>\nFull-stroke keyboard with separated numeric keypad<\/td>\n<\/tr>\n
CPU\u00a0\u00a0<\/b><\/td>\nZilog Z80 then Z80A<\/td>\n<\/tr>\n
SPEED\u00a0\u00a0<\/b><\/td>\n2.03 MHz<\/td>\n<\/tr>\n
RAM\u00a0\u00a0<\/b><\/td>\n16 KB (up to 48 KB)<\/td>\n<\/tr>\n
ROM\u00a0\u00a0<\/b><\/td>\n14 KB<\/td>\n<\/tr>\n
TEXT\u00a0MODES\u00a0\u00a0<\/b><\/td>\n32 or 64 columns x 16 lines<\/td>\n<\/tr>\n
GRAPHIC\u00a0MODES\u00a0\u00a0<\/b><\/td>\n128 graphic characters<\/td>\n<\/tr>\n
COLORS\u00a0\u00a0<\/b><\/td>\nmonochrome<\/td>\n<\/tr>\n
I\/O\u00a0PORTS\u00a0\u00a0<\/b><\/td>\nTape (500 or 1500 bauds), Centronics, RS232<\/td>\n<\/tr>\n
BUILT\u00a0IN\u00a0MEDIA\u00a0\u00a0<\/b><\/td>\nZero, one or two 5.25” disk-drives.<\/td>\n<\/tr>\n
OS\u00a0\u00a0<\/b><\/td>\nTRS DOS (other OSes were available : New DOS, LDOS, MultiDOS, …)<\/td>\n<\/tr>\n
POWER\u00a0SUPPLY\u00a0\u00a0<\/b><\/td>\nBuilt-in power supply unit<\/td>\n<\/tr>\n
PERIPHERALS\u00a0\u00a0<\/b><\/td>\nVarious Tandy peripherals<\/td>\n<\/tr>\n
PRICE\u00a0\u00a0<\/b><\/td>\nNo disk model : AU$1450 (Australia, 1981)
\n$2495 in 1984 for a complete system with 2×360 KB drives, TRSDOS, 64kb Ram, software and printer<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

The model 3 is generally regarded as the successor to the Model 1. Its two 5.25″ floppy disk drives could convert model 1 disks. Initially Radio Shack wanted to sell both the model 1 and 3 at the same time, but the FCC forced them to stop selling model 1. Is so they were discontinued […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[27],"tags":[],"class_list":["post-101","post","type-post","status-publish","format-standard","hentry","category-80s-computers"],"jetpack_featured_media_url":"","jetpack-related-posts":[],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"http:\/\/www.computer.etc.br\/site\/wp-json\/wp\/v2\/posts\/101","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.computer.etc.br\/site\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.computer.etc.br\/site\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.computer.etc.br\/site\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.computer.etc.br\/site\/wp-json\/wp\/v2\/comments?post=101"}],"version-history":[{"count":2,"href":"http:\/\/www.computer.etc.br\/site\/wp-json\/wp\/v2\/posts\/101\/revisions"}],"predecessor-version":[{"id":193,"href":"http:\/\/www.computer.etc.br\/site\/wp-json\/wp\/v2\/posts\/101\/revisions\/193"}],"wp:attachment":[{"href":"http:\/\/www.computer.etc.br\/site\/wp-json\/wp\/v2\/media?parent=101"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.computer.etc.br\/site\/wp-json\/wp\/v2\/categories?post=101"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.computer.etc.br\/site\/wp-json\/wp\/v2\/tags?post=101"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}