Editing TRS-80 (section)

=== Model II and III ===
By 1979, when Radio Shack launched the business-oriented, and incompatible, [[TRS-80 Model II]], the TRS-80 was officially renamed the TRS-80 Model I to distinguish the two product lines.

After some exhibitors at the 1979 Northeast Computer Show were forced to clarify that their products bearing the TRS-80 name were not affiliated with Radio Shack, publications and advertisers briefly began to use "S-80" generically rather than "TRS-80" under scare of legal action, though this never materialized.<ref name="reed s80">{{cite web |url=http://www.trs-80.org/what-does-s-80-mean/ |website=TRS-80.org  |title=What does S-80 mean? |access-date=February 26, 2020 |author=Reed, Matthew}}</ref>

Following the Model III launch in mid-1980, Tandy stated that the Model I was still sold,<ref name="newsletter_8009">{{cite web |url=https://archive.org/stream/TRS-80_Microcomputer_News_Volume_2_Issue_07_1980-09_Radio_Shack_US/TRS-80_Microcomputer_News_Volume_2_Issue_07_1980-09_Radio_Shack_US_djvu.txt|quote=First of all the Model I is not dropped, it is in the 1981 Radio Shack Annual catalog and the price is unchanged.|date=September 1980|access-date=2015-03-07|title=TRS-80 Microcomputer News}}</ref> but it was discontinued by the end of the year. Tandy cited one of the main reasons as being the prohibitive cost of redesigning it to meet stricter [[Federal Communications Commission|FCC]] regulations covering the significant levels of [[Electromagnetic interference|radio-frequency interference]] emitted by the original design.<ref name="REFOldComputerOrg"/><ref name="newsletter_8101">{{cite web |url=https://archive.org/stream/TRS-80_Microcomputer_News_Volume_3_Issue_01_1981-01_Radio_Shack_US/TRS-80_Microcomputer_News_Volume_3_Issue_01_1981-01_Radio_Shack_US_djvu.txt|title=TRS-80 Microcomputer News|date=January 1981|quote=[In November we] announced that manufacturing of the Model I computer would stop prior to the end of 1980 [primarily because] to meet the new FCC regulations we would have had to redesign the entire product, case and all [which would have made] the cost of the Model I as much as the Model III|access-date=2015-03-07}}</ref> The Model I radiated so much interference that, while playing games, an [[Amplitude modulation|AM]] radio placed next to the computer can be used to provide sounds.<ref name=AMRADIODigiBarn>{{cite web| url=http://www.digibarn.com/collections/systems/trs80-model3/index.html|title=TRS-80 Model III (Tandy/Radio Shack TRS-80 Model III) |work=DigiBarn Computer Museum |access-date=July 20, 2010 |url-status=live |archive-url=https://web.archive.org/web/20100727172325/http://www.digibarn.com/collections/systems/trs80-model3/index.html |archive-date= Jul 27, 2010 }}</ref> Radio Shack offered upgrades (double-density floppy controller, LDOS, memory, reliable keyboard with numeric keypad, lowercase, Level II, RS-232C) as late as its 1984 catalog.<ref>{{Cite web |title=1984 Radio Shack TRS-80 Computer Catalog |url=https://www.radioshackcatalogs.com/flipbook/c1984_rsc-10.html?fb3d-page=27 |access-date=November 30, 2022 |website=Radio Shack Catalogs |page=27}}</ref>