TRS-80 News

April 20, 2026 - VTOS Update

Tim Mann has gone through all known copies of VTOS on DMK and has prepared a complete set of Duplicator/Master/System/Data disks for what he could determine is the purest/best copy archived:

  • VTOS v3.0.0 Set - Duplicator/Master/System/Data - Created by Tim Mann
  • VTOS v3.0.1 Set - Duplicator/Master/System/Data - Created by Tim Mann

April 11, 2026 - VTOS Update

Tim Mann is still at it on his VTOS work. A lot of online documentation (and the source material it is based on) had talked about Tim Mann figuring out, back in the day, how to create a "Duplicator Disk", which just sat and polled floppy drives and made a "Master Disk" (the one which was sold to the public) whenever it found a diskette. None of those sources ever documented how. Tim has now re-figured that out, and kindly provided one based on the original image. A link to that has been added to the VTOS page. He also noted that the VTOS v3.0.1 image zip file, which contained 5 different VTOS v3.0.1 DMK's, had two which were badly hacked. Those two have been removed and the zip file updated. Thank you again, Tim, for not only your work here, but your work over the decades for the TRS-80!

April 12, 2026 - New Publications

John Gruver has provided some additional publications! Thank you, John!

Software

Title:Aerocomp Hard Disk Driver Boot Disk Creation InstructionsPublisher:AerocompYear:19xxSize:3,104,961Pages:2OCRed:Yes

Title:AIDSPLUS-II with AutoKey v1.0Publisher:SofTrendsYear:1985Size:340,738,561Pages:228OCRed:YesNotes:Set 2

Title:ARC31 v2.00Publisher:David Huelsmann-SEAYear:1987Size:1,713,005Pages:19OCRed:Yes

Title:Auto-Mate v1.0Publisher:SofTrendsYear:1986Size:1,153,043Pages:22OCRed:Yes

Title:Back-Rest Fast Hard Disk BackupPublisher:Breeze Computing-QSDYear:1983Size:4,523,689Pages:8OCRed:YesNotes:RS90-0244

Title:BeepPublisher:Logical Systems IncYear:19xxSize:2,674,383Pages:2OCRed:Yes

Title:BSORT and MOD324Publisher:MisosysYear:1984Size:11,562,553Pages:10OCRed:YesNotes:Set 2

Title:ConvCPM v2.0Publisher:Rich N Deglin-Roy SoltoffYear:1983Size:13,565,366Pages:16OCRed:Yes

Title:DescribePublisher:MisosysYear:1984Size:7,027,896Pages:6OCRed:Yes

Title:DiskMod EDTASMPublisher:MisosysYear:19xxSize:19,694,880Pages:16OCRed:Yes

Title:DISnDATa v1.0Publisher:C W Medlock - Pro-AM SoftwareYear:1982Size:4,154,090Pages:8OCRed:Yes

Title:FileAid for AIDS Plus-IIPublisher:SofTrendsYear:1985Size:11,001,184Pages:32OCRed:Yes

Title:FM File ManagerPublisher:Logical Systems IncYear:1983Size:44,313,467Pages:36OCRed:YesNotes:MiL-30-051

Title:Formation Forms Management SystemPublisher:Software Concepts-TandyYear:1983Size:174,992,121Pages:261OCRed:YesNotes:26-1527 / Set 2

Title:Hard Disk BackupPublisher:Montezuma MicroYear:1986Size:12,417,782Pages:13OCRed:Yes

Title:Home AccountantPublisher:Continental Software-Radio ShackYear:1983Size:37,094,721Pages:174OCRed:YesNotes:RS26-1511

Title:Le Script v1.2 Manual CPublisher:Anitek Software ProductsYear:1983Size:81,225,588Pages:96OCRed:Yes

Title:Little Brother 86 Installation Manual for MSDOSPublisher:MisosysYear:1991Size:126,635,185Pages:216OCRed:YesNotes:M86-510

Title:Little Brother Database Manager Installation Manual for LDOSPublisher:MisosysYear:1987Size:2,725,048Pages:12OCRed:YesNotes:Set 2

Title:Little Brother Database Manager Installation Manual for Model 4Publisher:MisosysYear:1991Size:3,233,187Pages:12OCRed:YesNotes:Set 3

Title:Little Brother Database Manager Supplemental DocumentationPublisher:Logical SystemsYear:1985Size:21,219,777Pages:32OCRed:Yes

Title:LS CompPublisher:Logical Systems IncYear:1983Size:1,788,603Pages:2OCRed:YesNotes:MiL-32-010

Title:LSI Help SystemPublisher:Logical Systems IncYear:1984Size:22,675,907Pages:22OCRed:YesNotes:MiL-30-060

Title:LS QFBPublisher:Logical Systems IncYear:1984Size:2,536,515Pages:2OCRed:YesNotes:M4 / MiL-32-010

Title:LU4 Library Utility v1.40Publisher:David HuelsmannYear:1986Size:7,727,568Pages:6OCRed:Yes

Title:LUM3 v1.23Publisher:David HuelsmannYear:1986Size:6,332,665Pages:5OCRed:Yes

Title:LUM4 v1.13Publisher:David HuelsmannYear:1986Size:6,332,665Pages:5OCRed:Yes

Title:LUMN3 v1.01Publisher:David HuelsmannYear:1986Size:6,332,669Pages:5OCRed:Yes

Title:Mach2Publisher:Karl A Hessinger-MicroConsultantsYear:1983Size:15,682,740Pages:14OCRed:Yes

Title:MARC4 v2.01Publisher:System Enhancement AssociatesYear:1987Size:11,046,710Pages:11OCRed:Yes

Title:Montes ToolkitPublisher:Montezuma MicroYear:1985Size:15,839,650Pages:12OCRed:Yes

Title:Montes WindowPublisher:Montezuma Micro-JBOYear:1984Size:26,643,579Pages:23OCRed:Yes

Title:Montezuma Micro 15MB Hard Disk SupportPublisher:Montezuma MicroYear:1984Size:33,650,299Pages:28OCRed:Yes

Title:Montezuma Micro CPM v2.2 Update to v2.3Publisher:Montezuma MicroYear:1986Size:1,453,818Pages:1OCRed:Yes

Title:Montezuma Micro Public Domain DisksPublisher:Montezuma MicroYear:19xxSize:2,076,518Pages:1OCRed:Yes

Title:M-ZAL CompilerPublisher:Jeff Krantz and David Willen-Computer Applications UnlimitedYear:1981Size:88,883,706Pages:106OCRed:YesNotes:Set 2

Title:NEWDOS-80 v2.0 for Model IPublisher:Apparat IncYear:1981Size:290,657,673Pages:292OCRed:YesNotes:Set 3 / Serial 025845

Title:NSweepPublisher:Dave RandYear:1984Size:16,322,725Pages:16OCRed:Yes

Title:Nulu v1.1Publisher:Martin MurrayYear:1985Size:23,533,879Pages:22OCRed:Yes

Title:OverDrivePublisher:Logical Systems IncYear:1984Size:4,723,518Pages:4OCRed:YesNotes:LSL35-220

Title:Pro-ESPPublisher:Richard Deglin-MisosysYear:1984Size:26,504,902Pages:26OCRed:Yes

Title:PRO-ZGraphPublisher:Karl Hessinger-MisosysYear:1983Size:24,634,971Pages:24OCRed:Yes

Title:Re-VisePublisher:SofTrendsYear:1986Size:28,846,917Pages:22OCRed:Yes

Title:SQ3 Squeeze v1.01Publisher:David HuelsmannYear:1985Size:10,720,083Pages:10OCRed:Yes

Title:SQ4 v1.01Publisher:David HuelsmannYear:1985Size:10,720,083Pages:10OCRed:Yes

Title:Sweep4 v1.00.00Publisher:Kachina Software GroupYear:1992Size:8,185,625Pages:9OCRed:Yes

Title:TBUG Z-80 Monitor and Debugging AidPublisher:Radio ShackYear:1978Size:489,788Pages:12OCRed:YesNotes:26-2001 / Set 2

Title:Toolbelt for TRSDOS 6.xPublisher:Breeze-QSDYear:1983Size:47,332,125Pages:44OCRed:YesNotes:Set 2

Title:USQ3 v1.01Publisher:David HuelsmannYear:1985Size:10,720,083Pages:10OCRed:Yes

Title:USQ4 v1.01Publisher:David HuelsmannYear:1985Size:10,724,784Pages:10OCRed:Yes

Title:XARC4Publisher:David Huelsmann-SEAYear:1987Size:13,044,092Pages:13OCRed:Yes

Title:X-FTS File Transmission SystemPublisher:Rick C Francis-MisosysYear:1984Size:8,768,443Pages:8OCRed:Yes

Title:XPort File Transport Utility v1.0Publisher:SofTrendsYear:1986Size:31,460,153Pages:24OCRed:Yes

Title:XT-4 v1.6.8Publisher:Bill AndrussYear:1986Size:13,460,019Pages:10OCRed:Yes

Flyers

Title:8100 S-100 Bus AdapterPublisher:HUH ElectronicsYear:1978Size:1,314,739Pages:2OCRed:Yes

Title:VS-100 for the Model 4Publisher:Alpha ProductsYear:19xxSize:217,927Pages:1OCRed:Yes

Radio Shack Memos

Title:Radio Shack Memo - Printer Port Connections MemoPublisher:Radio ShackYear:1978Size:3,090,572Pages:4OCRed:Yes

Hardware Guides

Title:Parts Required to Add Disk Drives to TRS-80Publisher:PercomYear:19xxSize:3,272,059Pages:3OCRed:Yes

Title:RAM Upgrade InstructionsPublisher:Author UnknownYear:1985Size:2,973,772Pages:2OCRed:Yes

Title:TRS-80 Serial I-O Preliminary DocumentationPublisher:Electronic SystemsYear:1978Size:5,302,841Pages:5OCRed:Yes

Title:Your Hard Disk Drive and YouPublisher:Montezuma MicroYear:19xxSize:3,148,860Pages:2OCRed:Yes

April 10, 2026 - VTOS Page

With extraordinary help from Tim Mann, the VTOS page is now up. It details the OS including the types of disks and copy protection, as well as a disassembly of the SYS files. It can be found at https://www.trs-80.com/sub-reference-dos-vtos-main.htm.

April 7, 2026 - VTOS Continues

Although I keep hitting the CLAUDE.AI caps very quickly, I am trying to progress with the VTOS v4.0.2 disassembly. Their way-too-tight caps just make it slow going.

I want to give a special shout out to Tim Mann and to Lawyrence Kesteloot, both of whom have been extremely helpful in navigating SYS6/SYS. This system file is in an ISAM/PDS format,meaning that it is a bunch of overlapping routines all jammed into one file, and special code is used to point to a specific byte in the file and say 'start running here'. Traditional disassembly simply won't work.

Tim has been extremely helpful in explaining/helping with the ISAM/PDS structure and answering questions as they came up.

Lawrence updated his trs-80tool a few times to assist, most recently to allow for file extraction from disks and to understand the additional codes inside a PDS sys file to permit disassembly. Before he did this, I failed 4 times in trying to disassemble the file.

You can download Lawrence's updated trs-80tool at https://www.my-trs-80.com/tool/#installation. Changelog for the past few (related) updates is:

  • v2.8.8 - Added --system flag to the convert command to extract system files from floppies. Updated so that disasm command understands LDOS-style PDS files for SYS6.SYS and SYS7.SYS, disassembling each overlay separately.
  • v2.8.7 - Disassemble VTOS .SYS files better by handling the CMD block type 0x10 (yanked load block) like 0x01 (data).
  • v2.8.6 - Handle .SYS files that are raw dumps of floppy boot sectors. These work with the info, hexdump, and disasm commands.

Thank you very much, Tim and Larence.

March 31, 2026 - Frustrating Tech Roadblocks

  • Yesterday the Disk Request Form came under really heavy attack and I received hundreds and hundreds of fake forms. The interesting part was that the attackers had a slight misconfiguration, and they were bleeding code into the fields. So I provided Gemini with my html/cgi as well as all their code. Gemini was able to determine what software they were using and updated the cgi accordingly. At least it stopped until the next time.
  • Claude usage caps are infuriating. I am trying to go through VTOS very carefully and the low caps are making this take a very very long time.

March 26, 2026 - New Books and Manuals

The next (VERY EXPENSIVE TO SHIP) shipment from Cris Peters has arrived!

Title:Clefs Pour Le TRS-80 Modeles I et III Tome 1Publisher:Remy Pineau-PSIYear:1983Size:118,583,963Pages:194OCRed:YesNotes:French

Title:Clefs Pour Le TRS-80 Modeles I et III Tome 2Publisher:Remy Pineau-PSIYear:1983Size:225,825,286Pages:202OCRed:YesNotes:French

Title:Desktop Plan-80Publisher:Personal Software-Radio ShackYear:19xxSize:140,405,537Pages:188OCRed:YesNotes:26-1594

Title:TRS-80 Model III-4 Handleiding Betreffende de Werking en de BASIC-ProgrammeertaalPublisher:TandyYear:1980Size:277,213,729Pages:274OCRed:YesNotes:Dutch
261-1069
Marked Up

Title:Handleiding Voor Level 1Publisher:TandyYear:1977Size:163,868,075Pages:244OCRed:YesNotes:265-9402 / Dutch / 1st Ed 2nd Printing

Title:TRSDOS and DISK BASIC HandleidingPublisher:TandyYear:1980Size:121,842,375Pages:202OCRed:YesNotes:26-9407 / Dutch

Title:Handleiding voor BASIC Level IIPublisher:Radio ShackYear:1980Size:150,090,568Pages:127OCRed:YesNotes:26-9405 / Dutch

Title:DMP-110 Operations ManualPublisher:TandyYear:1983Size:119,400,635Pages:68OCRed:YesNotes:26-1271

Thank you, Cris!

March 26, 2026 - Technical Manual

Sean O'Neill has provided a scan! Thank you, Sean!

Title:TRS-80 Technical Manual TroubleshootingPublisher:Radio ShackYear:1978Size:19,622,423Pages:24OCRed:YesNotes:Proof Copy / Set 3

March 26, 2026 - CPPIP / NPPIP / FPPIP v1.10

Mark Casteleijn has written a utility for TRS-80 CP/M to make copying files between disk drives, RetroNET Internet Adapter, and the FreHD hard disk emulator

Examples of the command line are:

CommandFunction
CPPIP FILE.DAT B:Copy FILE.DAT to drive B:
CPPIP *.COM B3:Copy all .COM files to drive B:, user area 3
CPPIP FILE.DAT B: /VCopy with CRC verify
CPPIP FILE.DAT B: /MMove (copy then delete source file)
NPPIP FILE.DAT IA:/Z/BK/Copy FILE.DAT to RetroNET IA store
FPPIP SD:FILE.COM A:Copy from FreHD SD card to drive A:
CPPIP /HDisplay full help information

You can find the GIT at https://github.com/ontheslab/cppip/releases/tag/v1.10.

March 25, 2026 - New Software

Scott Toenniessen has provided some additional software! Thank you, Scott!

Title:3-D Tic-Tac-Toe Year: 1984 Model: III Publisher: Rapidynamic Software

Title:3-D Tic-Tac-Toe Year: 1984 Model: 4 Publisher: Rapidynamic Software

Title:AOS Utilities Disk 1 Year: 19xx Model: III Publisher: Advanced Operating Systems

Title:Disk Drive Analyzer Year: 19xx Model: III/4 Publisher: Radio Shack + Verbatim Catalog Number: RS26-0413

Title:Master Diskette Directory III v1.2 Year: 1980 Model: III Publisher: Micro Systems Software Inc

Title:SuperKeys Year: 19xx Model: III Author: Phillip Mork Publisher: Programmers Guild

Title:XLR8er Installation Utility Year: 1986 Model: CP/M Publisher: Hi-Tech Inc

Title:XLR8er Installation Utility Year: 1986 Model: III Publisher: Hi-Tech Inc

Title:XLR8er Installation Utility Year: 1986 Model: 4 Publisher: Hi-Tech Inc

March 25, 2024 - TRSDOS v2.3

I have redone the TRSDOS v2.3 DOS disassemblies now that so much other work had been done in the interim. I am also now using Lawrence Kesteloot's trs80-tool to handle my disassembly generation (previously I used David Goben's Model III Disassembler after using George/Peter Philip's TRLD to convert /SYS to /CMD).

March 24, 2024 - JPC Products TC-8 Tape System

Sean O'Neill has let me know that David Shadoff has created a GIT to provide information about the JPC Products TC-8 Tape System for the TRS-80 Model I.

The GIT includes the EPROM, a KiCAD schematic, the manual, and the software.

The GIT can be found at https://github.com/dshadoff/TRS-80_TC-8.

March 24, 2026 - New Manuals

Ian Mavric has provided some additional manuals! Thank you, Ian!

Title:Air Flight SimulationPublisher:Dwight W Meyer-Instant SoftwareYear:1978Size:4,603,622Pages:24OCRed:YesNotes:IS0017R

March 23, 2026 - New Software

Ian Mavric has provided some additional software! Thank you, Ian!

Title:Ball Turret Gunner Year: 1979 Model: I Publisher: Instant Software Catalog Number: IS0051R

Title:Checker King Year: 19xx Model: Level 1 Author: Michael Marks Publisher: Personal Software

Title:Checker King Year: 19xx Model: I Author: Michael Marks Publisher: Personal Software

Title:Land Adventure Year: 1979 Model: I Author: Scott Adams Publisher: Adventure International

Title:Pirate's Cove Adventure Year: 1979 Model: I Author: Scott Adams Publisher: Adventure International

Title:TimeSet Year: 19xx Model: I Publisher: Alpha Product

Title:TString Year: 19xx Model: I Publisher: Alpha Product

Title:Veterans Ball Turret Gunner Year: 1979 Model: I Publisher: Instant Software Catalog Number: IS0051R

Title:Z-Chess III Year: 1980 Model: I Publisher: Adventure International

March 23, 2026 - New Tandy Scans

Gary K has kindly provided some additional scans. I have not looked to see how they differ, but more is always better!

Title:RS-232-C InterfacePublisher:TandyYear:1978Size:1,961,176OCRed:YesNotes:26-1145 / Black Cover / Set 2

Title:Tandy Technical Bulletin Notes and JumpersPublisher:TandyYear:1991Size:11,669,281OCRed:YesNotes:Set 2

Thank you, Gary!

March 21, 2026 - TRS-80 Trash Talk Live # 48

The next TRS-80 Trash Talk live show is Saturday, March 21, 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.

March 15, 2026 - Site Updates

  • The Model III NEWDOS/80 v2.0 Commented Disassembly is now complete. You can find the main page here.

March 14, 2026 - Article on Recovering S.C.A.P.

Terry Stewart has written up a very nice article about his restoration of Dick Smith's Stock Control and Pricing program.

March 11, 2026 - Site Updates

  • Paid another US$80 to get some more Dutch and French TRS-80 manuals and books sent over. Will scan and post once they arrive from Belgium.
  • Thanks to the versatility of CSS3, added a little floppy disk icon (💾) after download links throughout the site to further identify that they aree downloads.

March 11, 2026 - TRS80Tools Updated to v2.8.6


Lawrence Kesteloot has released an updated copy of his trs80tools, now new version 2.8.6.

I don't know every change, but I know what he has been helping me with - trying to find a PC based TRS-80 disassembler that can come up with comparable output to a TRS-80 based one. In this regard his changes were:

  1. Handle .SYS files that are raw dumps of floppy boot sectors. These work with the info, hexdump, and disasm commands.
  2. Add --full and --data-comment flags to the disasm command.

The updated version can diassemble SYS files, including those without standard CMD file markers (like BOOT/SYS), and with the right command line options, can produce a listing file just like DISASSEM/CMD (with the address, hex, op code, and ascii in fixed columns).

You can download it for the Windows, Mac, and Linux at https://www.my-trs-80.com/tool/#installation.

And for those who want this kind of output there are a LOT of flags to override default behavior. I used
trs80-tool disasm --data-comment --upper --full --no-labels --listing --no-known --hex-format h

March 9, 2026 - Continuing work on NEWDOS/80 v2.0 for the Model III Disassembly [IN PROGRESS]

SYS10/SYS and SYS11/SYS have been added. You can find the main disassembled NEWDOS/80 v2.0 for the Model III page here. I am now out of credits until late Thursday night.

March 7, 2024 - Site Updates

  • The little indicator as to whether a secton has been collapsed or expanded has been fixed.
  • BASIC/CMD for NEWDOS/80 v2.0 for the Model III has been disassembled.

March 5, 2024 - Site Updates

Some site updates:

  • Added Le Guepard and the PROF-80 to the Clones Page thanks to Pascal.
  • Enabled a very simple "lazy load" on some graphic heavy page, including this one, to make them load faster
  • Added a RSS feed (third party) to the site. Button is on the left.

March 4, 2024 - TRS8BIT Newsletter Vol 20 Issue 1 Released

In this 88 page edition, the first of our 20th year, Patrick Bureau fixes an ASTEC PSU, E.T.Fonehume tries coding on a Model 1 with 2 BASIC one-liners. Ian Mavric has his quarterly T.A. update, continues with part 3 of his Tandy 2000 history and looks at the keyboards for the models 1,3 and 4. Vince Otten has part 5 of his series 'The Power of the ROM' and investigates an early implementation of LISP for the Model 1. Pascal Holdry has news of the New JFD-CP. Egoitz Campo has the results of his latest Basque TRS-80 tournament. And as always, there's our regular features 'Surfin the Net' and 'The Way We Were' together with a new quiz, 'Countdown'.

You can read more about it on the TRS8Bit Page and you can download it either from http://TRS-80.org.uk/ or download a repaired and OCR'd (as best as possible given the font selections) version here.

March 3, 2026 - Continuing work on NEWDOS/80 v2.0 for the Model III Disassembly [IN PROGRESS]

SYS15/SYS, SYS16/SYS, and SYS17/SYS have been added, which finishes the non-BASIC system modules. You can find the main page here.

March 3, 2026 - Article on Fixing a Model 1

There is a nice writeup on Leaded Solder about a Model I found in the trash, and the efforts to bring it back to life.

March 1, 2026 - Continuing work on NEWDOS/80 v2.0 for the Model III Disassembly [IN PROGRESS]

SYS9/SYS and SYS14/SYS have been added. You can find the main page here.

February 27, 2026 - NEWDOS/80 v2.0 for the Model III Disassembly [IN PROGRESS]

While it will take many weeks to get done, I have started the commented disassembly of NEWDOS/80 v2.0 for the Model III.

As of this posting, BOOT/SYS and SYS0/SYS-SYS8/SYS are done. You can find the main page here.

February 25, 2026 - FreHD Accessories at NEWSOFT

Jay Newirth has let me know that he has two new FreHD related products:

FreHD External Case Complete Kit (Includes FreHD)

FreHD External Case (Bare)

You can visit NewSoft here.

February 21, 2026 - TRS-80 Trash Talk Live # 47 Starts Soon

The next TRS-80 Trash Talk live show is TODAY, February 21, 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.

February 18, 2026 - New Software from Irwin Burton

Irwin has written two DiskDisk related programs. He writes:

CDD/CMD v2.0.0 is a little utilty to use with the DiskDisk utility from MISOSYS that allows us to emulate the MS-DOS CD command. I wanted to be able to change DiskDisks as easy as I change subdirectories on MS-DOS.
Usage: CDD [:dn] DDfilespec
Where DDfilespec is the name of the DiskDISK file you want to mount. and :dn is an optional drive number you want to use for that file. The default is :4.

RMD/CMD v2.0.0 allows for the DISABLE to disable not just a DiskDISK mounted at :4, but the user is now free to disable a DiskDISK no matter which drive it is mounted to.
Usage: RMD [:dn]

Download Links:

February 17, 2026 - New Software from Ian Mavric

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

Title:BMON Basic Monitor v1.2

Title:BPA Basic Programming Assistant

Title:Life: BASIC Version

Title:Life: Machine Language Version

Title:Misosys Disassembler v1.2

Title:Skirmish-80

Title:Space Games 3

Title:Z80 Disassembler

February 9, 2026 - Two Dutch TRS-80 Manuals

Cris Peeters has kindly provided the following manuals in Dutch

Title:LS-DOS 6.3 Update for TRSDOS 6.2XPublisher:TandyYear:19xxSize:86,033,395Catalog:706-2292Pages:27OCRed:YesNotes:Dutch

Title:Model 4-4P Disk SystemPublisher:TandyYear:19xxSize:942,792,899Catalog:701-1069-1080Pages:510OCRed:YesNotes:Dutch

February 6, 2026 - Popular Computing Newsletter

GrumpyX has kindly provide an issue of the opular Computing Newsletter

February 5, 2026 - Assorted Radio Shack Memos

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

February 2, 2026 - Some news updates

  • TRS-IO v1.1 Tuc has TRS-IO++ fully assembled boards in stock and ready for immediate shipping. Visit his site for more information.
  • Dusty MX Keyboard Dusty2050 has TRS-80 Model I keyboards based on MX keys for sale. Visit his DustysVintageWorkshop ebay store.
  • 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
  • NameIt Screenshot 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.
  • The next TRS-80 Trash Talk (#47!) is scheduled for Saturday, February 21, 2026 at 6:00PM Pacific Daylight Time.

January 28, 2026 - Compilable Model I/III Level II ROM Source Code

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:

DirectiveDescription
#DEFINE VER12Uncomment to degrade the ROM from version 1.3 to 1.2.
#DEFINE VER13Default version if VER12 is not defined; does not need to be explicitly uncommented.
#DEFINE EACA80Enables Dick Smith System-80 (EACA) hardware support. Targets the core 12KB ROM. It is recommended to also define VER12 for compatibility.
#DEFINE FREHDBTEnables the FreHD auto boot feature. Requires version 1.3 ROM; incompatible with VER12. Consider enabling NMIHARD for forced resets.
#DEFINE NMIHARDConfigures NMI (reset) to always perform a hard reset (0066h). Prevents non-floppy systems from performing a soft reset to the READY> prompt.
#DEFINE LOWCASEDisables alpha character translation to the 00h-1Fh range. Useful for lower-case hardware mods or specific font ROMs.
#DEFINE FASTMEMSpeeds up the startup memory check by testing only the first byte of every 256-byte page.
#DEFINE BUGFIX5Fixes Error 5 (08A7H) regarding INT(DoubleValue) rounding.
#DEFINE BUGFIX8Fixes Error 8 (1009H) regarding the PRINT USING minus sign at the end of a field.
#DEFINE PATCHA macro that includes NMIHARD, LOWCASE, FASTMEM, BUGFIX5, and BUGFIX8.
#DEFINE SIZE16KPads the ROM image with $FF to reach a total size of 16KB for use in large paged ROM systems.
#DEFINE _EMBEDStrips hardware and I/O routines, leaving the BASIC language as standalone code for use in Level II BASIC for CP/M.

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

DirectiveDescription
#DEFINE NEWBOOTEnables a new boot routine which asks for "diskette?" when no disk is detected and retries. It also allows for break to be pressed at any time. (Credit : John Swiderski)
#DEFINE FREHDBTEnables the FreHD auto boot feature, i.e. the Auto boot ROM. This requires version 1.3 ROM as a base, please do NOT define VER12 as it is not compatible (it will be ignored anyway) Consider also enabling NMIHARD to ensure reset (on non-floppy machine) will force a reset.
#DEFINE NOMEMSIZESkip user input of Memory Size? override at startup with M key. (Credit : John Swiderski)
#DEFINE FASTMEMSpeed up startup memory size check by checking first byte of every 256 page, rather than every byte.
#DEFINE NMIHARDSet NMI (reset) as always perform a hard reset. Normally on non-floppy systems NMI performs a soft reset returning to the READY> prompt with the basic program intact. This is useful in system without floppy disk to force a full reset (0066h)
#DEFINE LOWCASEDisable Alpha character translation of letters A-Z,a-z to the values on range 00h to 1Fh. This is useful when a lower case mod is installed, but an alternate video driver has not been installed, or where the font rom on the machine has the alternate characters in the 00h 1Fh range (0471h)
#DEFINE MSGSTARTEnhanced startup message showing Free Bytes available to BASIC
#DEFINE KEYBOUNCEEnables the Keyboard debounce routines that where introduced in rev1.3
#DEFINE BUGFIX1Fix Error 1 - 04F6H - 32 Character Mode Line Length
#DEFINE BUGFIX2Fix Error 2 - 153EH - Random Number Single Precision Overrun
#DEFINE BUGFIX5Fix Error 5 - 08A7H - INT(DoubleValue) rounding
#DEFINE BUGFIX7Fix Error 7 - 0EF2H - Space after type declaration tag
#DEFINE BUGFIX7CFix Error 7C - 213DH - Space after TAB token
#DEFINE BUGFIX8Fix Error 8 - 1009H - PRINT USING, - sign at end of field
#DEFINE BUGFIX11Fix Error 11 - 2301H - Overflow on Integer FOR loop
#DEFINE BUGFIX13Fix Error 13 - 1222H - Display of Single Precision Numbers
#DEFINE EACA80(OPTIONAL) uncomment to enable Dick Smith System-80 (EACA) hardware support. This only targets the core 12kb ROM, and does not include the latter Rom extensions
#DEFINE SIZE16K(OPTIONAL) Will pad the end of the rom with $FF to 16KB size. useful if want to append multiple ROM images for used in large 16K paged rom

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.

January 18, 2026 - TRS80GP Updated to v2.5.6

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

January 16, 2026 - TRS-80 Trash Talk Live # 45 set for January 16, 2026

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.

January 6, 2026 - New Software

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!

January 3, 2026 - Key Commander

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!

January 1, 2026 - Site Updates

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.

December 31, 2025 - Older News

Older news can be found here ...