TRS-80 News

Some FRESH items I have on eBay to support the site ...

Software and Manuals

Description	Item	Picture
Deskmate (Original Binder/Manual/Disks/Quick Reference)	177844610338
Model II Owner's Manual (Original Binder/Manual)	177844633434
Pascal v2.0 (Original Binder/Manual/Software)	177844639630

Some items I have on eBay to support the site ...

Books

Software

GrumpyX has kindly provide an issue of the opular Computing Newsletter

Title:Popular Computing NewsletterPublisher:Popular Computing IncYear:1978Size:1,062,862Pages:16OCRed:YesNotes:1978-12

GrumpyX has kindly provide a whole bunch of Radio Shack related scans ...

Title:Product Flyer - Carry In Service ContractPublisher:Radio ShackYear:1979Size:61,313Pages:1OCRed:Yes

Title:Product Flyer - Cobol Development System Model IIPublisher:Radio ShackYear:19xxSize:209,970Pages:4OCRed:YesNotes:26-4703

Title:Product Flyer - Fortran Development System Model IIPublisher:Radio ShackYear:19xxSize:247,816Pages:4OCRed:YesNotes:26-4701

Title:Product Flyer - Model II LeasingPublisher:A and A FinancialYear:19xxSize:827,162Pages:2OCRed:Yes

Title:Product Flyer - Network IPublisher:Radio ShackYear:19xxSize:433,883Pages:2OCRed:YesNotes:26-1210

Title:Radio Shack TRS-80 Software LibraryPublisher:Radio ShackYear:19xxSize:57,940Pages:1OCRed:YesNotes:Introduction to BASIC Part I / 26-2150

Title:Radio Shack TRS-80 Update 1978-02Publisher:TandyYear:1978Size:475,923Pages:4OCRed:YesNotes:07-05-1978

Title:Radio Shack TRS-80 Update 1978-03Publisher:TandyYear:1978Size:239,398Pages:2OCRed:YesNotes:08-10-1978

Title:Radio Shack TRS-80 Update 1979-09Publisher:TandyYear:1979Size:533,328Pages:4OCRed:YesNotes:09-28-1979

Title:Radio Shack TRS-80 Update 1979-10Publisher:TandyYear:1979Size:205,569Pages:2OCRed:YesNotes:10-16-1979

Title:Radio Shack TRS-80 Update 1979-11Publisher:TandyYear:1979Size:206,632Pages:2OCRed:YesNotes:10-31-1979

Title:Radio Shack TRS-80 Update 1979-12Publisher:TandyYear:1979Size:473,357Pages:6OCRed:YesNotes:11-15-1979

Title:Radio Shack TRS-80 Update 1979-13Publisher:TandyYear:1979Size:210,533Pages:2OCRed:YesNotes:12-03-1979

Title:Radio Shack TRS-80 Update 1979-14Publisher:TandyYear:1979Size:310,611Pages:4OCRed:YesNotes:12-31-1979

Title:Radio Shack TRS-80 Update 1980-04Publisher:TandyYear:1980Size:147,613Pages:2OCRed:YesNotes:02-01-1980

Title:Radio Shack TRS-80 Update 1980-05Publisher:TandyYear:1980Size:83,878Pages:1OCRed:YesNotes:02-04-1980

Title:Radio Shack TRS-80 Update 1980-09Publisher:TandyYear:1980Size:372,188Pages:4OCRed:YesNotes:04-02-1980

Title:Radio Shack TRS-80 Update 1980-10Publisher:TandyYear:1980Size:285,200Pages:4OCRed:YesNotes:04-07-1980

Title:Radio Shack TRS-80 Update 1980-11Publisher:TandyYear:1980Size:337,548Pages:4OCRed:YesNotes:04-29-1980

Title:Radio Shack TRS-80 Update 1980-13Publisher:TandyYear:1980Size:386,403Pages:4OCRed:YesNotes:06-27-1980

Title:Radio Shack TRS-80 Update 1980-14Publisher:TandyYear:1980Size:341,911Pages:4OCRed:YesNotes:07-07-1980

Title:Radio Shack TRS-80 Update 1980-16Publisher:TandyYear:1980Size:611,867Pages:8OCRed:YesNotes:09-01-1980

Title:Radio Shack TRS-80 Update 1980-17Publisher:TandyYear:1980Size:378,338Pages:4OCRed:YesNotes:09-12-1980

Title:Radio Shack TRS-80 Update 1980-18Publisher:TandyYear:1980Size:595,581Pages:8OCRed:YesNotes:10-09-1980

Title:Radio Shack TRS-80 Update 1980-20Publisher:TandyYear:1980Size:338,670Pages:4OCRed:YesNotes:11-26-1980

Title:Radio Shack TRS-80 Update 1980-22Publisher:TandyYear:1980Size:722,752Pages:8OCRed:YesNotes:12-24-1980

Title:Radio Shack TRS-80 Update 1981-01Publisher:TandyYear:1981Size:312,942Pages:4OCRed:YesNotes:01-14-1981

Title:Radio Shack TRS-80 Update 1981-02Publisher:TandyYear:1981Size:166,877Pages:2OCRed:YesNotes:01-21-1981

Title:Radio Shack TRS-80 Update 1981-03Publisher:TandyYear:1981Size:358,883Pages:4OCRed:YesNotes:02-03-1981

Title:Radio Shack TRS-80 Update 1981-06Publisher:TandyYear:1981Size:373,943Pages:4OCRed:YesNotes:04-01-1981

Title:Radio Shack TRS-80 Update 1981-07Publisher:TandyYear:1981Size:357,870Pages:4OCRed:YesNotes:04-23-1981

Title:Radio Shack TRS-80 Update 1981-08Publisher:TandyYear:1981Size:379,310Pages:4OCRed:YesNotes:05-08-1981

Title:Radio Shack TRS-80 Update 1981-09Publisher:TandyYear:1981Size:378,102Pages:4OCRed:YesNotes:05-18-1981

Title:Radio Shack TRS-80 Update 1981-10Publisher:TandyYear:1981Size:329,809Pages:4OCRed:YesNotes:06-03-1981

Title:Radio Shack TRS-80 Update 1981-11Publisher:TandyYear:1981Size:82,093Pages:2OCRed:YesNotes:06-15-1981

Title:Radio Shack TRS-80 Update 1981-12Publisher:TandyYear:1981Size:60,460Pages:2OCRed:YesNotes:06-24-1981

Title:Radio Shack TRS-80 Update 1981-13Publisher:TandyYear:1981Size:179,064Pages:2OCRed:YesNotes:06-29-1981

Title:Radio Shack TRS-80 Update 1981-14Publisher:TandyYear:1981Size:135,527Pages:2OCRed:YesNotes:07-08-1981

Title:Radio Shack TRS-80 Update 1981-18Publisher:TandyYear:1981Size:181,324Pages:2OCRed:YesNotes:08-12-1981

Title:Radio Shack TRS-80 Update 1981-21Publisher:TandyYear:1981Size:191,934Pages:2OCRed:YesNotes:09-08-1981

Title:Radio Shack TRS-80 Update 1981-22Publisher:TandyYear:1981Size:212,757Pages:2OCRed:YesNotes:09-29-1981

Title:Radio Shack TRS-80 Update 1981-23Publisher:TandyYear:1981Size:212,395Pages:2OCRed:YesNotes:10-09-1981

Title:Radio Shack TRS-80 Update 1981-27Publisher:TandyYear:1981Size:211,238Pages:2OCRed:YesNotes:11-06-1981

Title:Radio Shack TRS-80 Update 1981-31Publisher:TandyYear:1981Size:228,069Pages:2OCRed:YesNotes:12-18-1981

Title:Radio Shack TRS-80 Update 1982-01Publisher:TandyYear:1982Size:267,637Pages:2OCRed:YesNotes:01-07-1982

Title:Radio Shack TRS-80 Update 1982-02Publisher:TandyYear:1982Size:226,611Pages:2OCRed:YesNotes:01-21-1982

Title:Radio Shack TRS-80 Update 1982-03Publisher:TandyYear:1982Size:225,192Pages:2OCRed:YesNotes:02-22-1982

Title:Radio Shack TRS-80 Update 1982-04Publisher:TandyYear:1982Size:292,951Pages:3OCRed:YesNotes:03-08-1982

Title:Radio Shack TRS-80 Update 1982-05Publisher:TandyYear:1982Size:540,253Pages:5OCRed:YesNotes:04-06-1982

Title:Radio Shack TRS-80 Update 1982-06Publisher:TandyYear:1982Size:386,402Pages:4OCRed:YesNotes:04-27-1982

Title:Radio Shack TRS-80 Update 1982-07Publisher:TandyYear:1982Size:456,079Pages:4OCRed:YesNotes:05-24-1982

Title:Support Group ListPublisher:TandyYear:1983Size:203,572Pages:2OCRed:Yes

Title:Thank You for Tampa Computer ShowPublisher:TandyYear:1980Size:257,516Pages:1OCRed:Yes

Title:TRS-80 Merchandising Memo 81-09 [700 Series Software Items]Publisher:TandyYear:1981Size:99,584Pages:1OCRed:YesNotes:700 Series Software Items

Title:TRS-80 System Selection GuidePublisher:TandyYear:19xxSize:60,836Pages:1OCRed:Yes

• Tuc has TRS-IO++ fully assembled boards in stock and ready for immediate shipping. Visit his site for more information.

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• Dusty2050 has TRS-80 Model I keyboards based on MX keys for sale. Visit his DustysVintageWorkshop ebay store.

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• KiwiSinceBirth has pointed out that his Model I and Model III updated ROMs come with 16 pre-built configurations as well as source code, for those daunted by the compilation process

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• Irwin Burton has written two new TRS-80 Model III programs - NAMEIT and PWD. NameIt allows for all characters to be in a LDOS disk label and PWD (like the unix command) will give you a quick update of what disk is mounted in a drive number. Source is included.

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• The next TRS-80 Trash Talk (#47!) is scheduled for Saturday, February 21, 2026 at 6:00PM Pacific Daylight Time. To watch, visit https://www.youtube.com/@TRS80TrashTalk. If you want to participate, reach out for the zoom link.

KiwiSinceBirth has posted updates to his compilable source file for the Model I/III ROM

He has a traditional Model I Level 2 BASIC ROM and Model III Level 2 BASIC ROM which have comments and which can be compiled into a workable ROM. His source differs from a standard disassembly in the following ways

• Replaced all disassembler generated labels with meaningful labels.
• Ensured all jumps (JR and JP) reference valid code labels.
• Replaced all 3xxxH hardware references with .EQU definitions.
• Replaced all 4xxxH buffer references with .EQU definitions.
• Replaced all xxH byte references with appropriate decimal or ascii values, and/or .EQU definitions.
• Replaced all generated op-code with Byte .DB .DW definitions for DataTables/Text/Constants/Etc
• Added code documentation from various sources at the code block / function level.
• Replaced incorrect op-codes, where Better Else "Trick" was used.

These ROMs can also be somewhat customized as follows:

He has also developed an enhanced ROM for both machines which have slightly broken compatibility, but which otherwise include new support, features, and some bug fixes

To make room for all this, cassette support has been removed.

Additionally, you can now download pre-built binary images for most common configurations. There are 16 variants. Hr did this to make it easier to use, no assembly required, no defines to understand, just choose the ROM that makes sense. It also means the vanilla configurations can be compared against official roms, to check for binary compatibility. This build process is automated by GITHub anytime a change is made, it will assemble and publish a new release.

• Dick Smith System 80 (Official)
• Dick Smith System 80 FreHd Patched
• Dick Smith System 80 Patched
• Model I Rev 1.2 (Official)
• Model I Rev 1.3 - FreHD Patched
• Model I Rev 1.3 - Patched
• Model I Rev 1.3 (Official)
• Model I Rev 1.4 (Enhanced 50Hz)
• Model I Rev 1.4 (Enhanced)
• Model I Rev 1.4 (Enhanced)
• Model III - FreHd Patched
• Model III - FreHd Patched 50Hz
• Model III - Patched
• Model III - Patched 50Hz
• Model III (Official)
• System 80 Rev 1.4 (Enhanced)

Visit his site here.

George and Peter Phillips have updated their awesome TRS80GP emulator to v2.5.6. Changes are:

New Features:

• Added "feed" and "delay" script commands.
• Backtrace now annotated with labels when they are available.
• Directly loaded Model 1 and 3 BASIC programs now convert ^ to [
• Disk viewer can be used to modify sector data.
• Gendon character ROM available for model 1 via -charrom :gendon
• Green Thumb emulation.
• IMD disk image saves blank tracks as empty records, allows HxC 0x80 modes.
• Implemented "load" and "run" script commands.
• Printer menu options for 80 and 132 column fixed-width printing.
• Supermem (-mem supermem) and X-MEM/80 support for Model 1 (-mem xmem80).

Bug Fixes:

• 6809 subtract/compare operations no longer modify the half-carry flag.
• Add delay to FDC Restore to fix Arranger II adding disks.
• Disk viewer/disk summary works correctly for hard drives using sector ID ranges 1..n
• Fixed Mac context menu
• Fixed Mac debug disassembly window for some processors.
• Improved IM 0 mode for Model I allowing TPM to format a diskette.
• Memory views no longer wrap around to address 0; it was too confusing.
• Model 12, etc. back to immediately reacting to bank swap (port A8H).
• RS-232 transmit interrupt asserted at when RS-232 reset.
• Use only 4 bits of FreHD commands like the real FreHD.

You can download it at http://48k.ca/trs80gp.html

The next TRS-80 Trash Talk live show is January 16, 2026 at 6:00PM Pacific Daylight Time / 9:00PM Eastern Daylight Time!

You can watch on the TRS-80 Trash Talk channel: https://www.youtube.com/channel/UCXkGugvdCkpkMDylVQb9gfg

If you want to participate in the live zoom session, reach out to trs80trashtalk at gmail dot com for information.

Title:Ham Package IPublisher:Instant SoftwareYear:1978Size:2,504,157Pages:12OCRed:Yes*

Title:Electronics IPublisher:Rick Morel - Instant SoftwareYear:1978Size:4,185,191Pages:22OCRed:Yes*

Ian Mavric was kind enough to send over some missig items! Thank you, Ian!

Paul Hopkins was kind enough to send over Key Commander, one of the known missing files!

The manual can be downloaded Here

And the CAS/WAV image can be downloaded Here

Thank you, Paul!

Happy New Year everyone!

To make linking easier, I have added clipboard icons to the Hardware, Software, and Service Manual pages.

The SSL certificate for www.trs-80.org has been purchased and applied, so related security warnings should have stopped.

TRSDOS v1.3 and 2.3 have been disassembled and commented.

The main page for TRSDOS v2.3 for the Model I can be found here.

The main page for TRSDOS v1.3 for the Model III can be found here.

NEWDOS/80 v2.0 for the Model I has been disassembled, with most of the heavy lifting done by Claude AI, with help from Gemini and Grok. They all definitely have their strengths and weakenesses.

The main page can be found here.

I have also created a main-menu entry for all disassemblies, to make them easier to get to. That can be found on the navbar, or here.

Shawn Sijnstra has released v18 of this Infocom Adventure Interpreter line. His changelog:

• Code optimisation for speed and size including init, bwdcopy, fwdcopy, tokenize, inibuf, find_word, next_token, llf
• Rewrote all core code to assume auto-increment of ZPC to improve speed and size
• Bugfix: handle auto wrapped line followed by immediate line feed
• Additional space freed to allow for more game cache
• Memory map reshuffled to reduce disk size. CP/M version 900+ bytes smaller freeing up extra disk space

The official site can be found at:

• Model I Version
• Model III Version
• Model 4 Version

Jens Guenther has updated his Windows/Linux fork of the SDLTRS Emulator to v1.2.34

Changelog:

• Added Holmes VID-80 (VX-3) support for TRS-80 Model III.
• Added 48 KB extended memory for Holmes VID-80 (VX-3).
• Added 256/512/768/1024 KB for Alpha Technology SuperMem.
• Added X-MEM/80 (Michael Wessel) 16K page Model I memory extension.
• Added printer type for text only output.
• Fixed LNW80 Model II banking and 80x24 text mode support.
• Fixed some bugs and internal improvements.

You download the source and binaries here. This download includes the required SDL2.dll

The official site can be found at https://gitlab.com/jengun/sdltrs

Lawrence Kesteloot has updated his TRS80Tool to v2.8.2. Changelog is:

Fix a bug in the display of file sizes in the dir command.

You can download a ZIP with the Windows, Mac, Linux, and Source combined right here.

Lawrence has also updated his online TRS-80 Assembly Language IDE, found at https://www.my-trs-80.com/ide/. Changelog is:

• The “File” menu has a new “Play Cassette Audio” command to play the assembled program as an audio sound. Connect your computer’s audio to a real machine and use the SYSTEM BASIC command to start the load.
• The “Edit” menu has a new “Auto-complete on Tab” option to set whether the Tab key accepts the auto-completion suggestion.
• The “View” menu has a new “Show Statistics” option that displays code and data statistics for the whole program and the current selection.
• The “View” menu has a new “Screen Size” option to change the size of the screen, in case you want more room for the text editor.
• The “Debug” menu has a new “Inspectors” sub-menu to show a Floppy Disk Controller inspector.
• The “Help” menu has a new “About” option to show the IDE’s version and release date.

If you sent in a disk request which was not processed, you have my apologies. As part of the site redesign, I seem to have dropped the perl script which actually sent the disk request form in! If you emailed me, it was processed; but if you silently sent in the form and that's it ... it wasn't. I have fixed the form so it should submit. If you requested disks and did not get them, please fill out the form again.

You can download it from http://TRS-80.org.uk/ or an OCR'd version here.

Issue Information:

Issue Summary:

George Phillips discusses Bart Jeroen Hemstra’s winning competition entry. Ian Mavric shows how to downgrade a Model 1 to Level 1, has a report of the 2025 Tandy Assembly and takes a look at Model 2000 hardware add-ons with part 2 of his series. Vince Otten has part 4 of his ‘Power of the ROM’ articles and also looks at early PASCAL compilers for the Model 1. E.T. Fonehume has a BASIC one-liner screen-saver, for a seasonal snowflake. Pascal Holdry has news of his latest, fantastic, re-engineering hardware tasks. There’s a quick look back to the early 1980’s in ‘The Way We Were’. Also, there’s a round-up of a few U.K. Ebay bargains, a maze puzzle just for fun and finally, ‘Surfin the Net’ comes up with an ‘all new’ Model 1 motherboard. 84 pages of pure Tandy joy!

Table of Contents

I wanted to make it easier for people to be able to refer to specific portions of the site, so I have added CSS and Javascript that will put a little clipboard up on headers. If you click the clipboard, the URL for that specific header will be copied to your clipboard. Thank you Gemini for the code!

The commented/explained disassembly of BACKUP/CMD from Model I TRSDOS v2.3 can be found here and TAPEDISK/CMD can be found here.

Amardeep Chana has written up step-by-step instructions to modify a Model I to run much cooler and more reliably. It involves modifying the system to no longer need the +/-12V to power the RAM, focusing solely on 5V.

You can download the step-by-step guide here.

The Easter Egg page page has been updated with a reverse engineering of Randy Cook's secret screen from TRSDOS v2.x. Thanks to George Philips and absolutely no thanks to Gemini who halucinated an elaborate routine that didn't exist!

Thank you to everyone that has been reporting in with questions and issues!

And special thanks to Ven Reddy who pointed out that when I moved off of WordPress I lost the Site Search function. I personally consider the site too unwieldy and too hard to find anything, and I wrote it - so I can imagine what everyone else goes through. So the loss of site search was a big loss. The site search page is now present on the navbar but can be found here as well.

If anyone has any better ideas as to how to organize the navigation or make it easier to find subpages and content, please let me know.

In other updates, I have been working on the disassembly pages trying to add more information to the input/output portions. Right now it's in the form of adding bit tables to show all the options and explanations within each comment. Also, as of last night, the disassemblies are "mobile friendly".