TRS-80 News

Gabor Kepes has written a new game for the TRS-80 Model I and HT1080Z called LEO25. He is asking people to try it out and report any bugs

You can download a DSK of the game at https://gaborkepes.itch.io/leo25.

Quentin Barnes has updated his GW2DMK Utility v0.5 noting the following changes:

• USB bus scanning for the Greaseweazle should now work. No need to always specify -G|--device option.
• Autodetect floppy drive when -d|--drive option not given.
• New -Z|--serial option to give a GW serial number if more than one GW.
• New -B|--bustype option to specify type of floppy cable (ibm or shugart).
• New -C|--config|--noconfig options to specify an INI file (or disable it) for default arguments. See the man pages under section "CONFIGURATION FILE" for details.
• The -R|--replay option is now implemented. Uses -U logfiles instead of a level 7 -u logfile like in cw2dmk.
• -y|--testmode
• -h|--hd
• -f|--fillmode
• -p|--precomp
• -a|--rateadj
• --dither

This wonderful program uses the still-being-manufactured Greaseweazle instead of the defunct Catweasel, to create DMK images from real disks. This utility permits caching of good sectors to rebuild damaged tracks, making it far superior to any other method of archiving.

You can see entire GITHUB project at https://github.com/qbarnes/gw2dmk. For those who want a faster download, you can download all OS releases (Linux: ARM Arch64, ARMv7l, x86_64 and Windows: 32- and 64- bit), including source code, from here.

Dusty has unveiled his Model I Case with Bezel and Badge product! He also has put up a web page --- https://dustysvintageworkshop.com/.

You can see all of his EXTREMELY impressive work on that site! e-Commerce to come at some point.

Dusty of Dusty's Vintage Workshop has two (2) finished model I replacement cases for sale

You can see the eBay listing at https://www.ebay.com/itm/158005625691

Scott Toenniessen has provided LDOS v5.3.0 for the Lobo Max-80.

You can download it here

I have no way of testing this image.

Dusty of Dusty's Vintage Workshop has been fine-tuning his 3-D printable Model I case, and has released the STL files and builder's guide.

You can download it here

Marcel Erz of RetroStack has released the full schematic, Gerber files for the common manufacturers, and a complete BOM for his reverse engineered and updated version of the TRS-80 Model I Expansion Interface.

You can read all about it at https://www.patreon.com/RetroStack/posts/trs-80-model-1-d-162928605

The prolific Eghbert Azure has provided more links

• H-Dos for the Genie at https://github.com/Egbert-Azure/TRS80M1/blob/main/diskimages/GDos/hdos.md
• A banker hardware hack he made to his Model I at https://github.com/Egbert-Azure/TRS80M1/blob/main/hardware/model1-tuneup-1992.md

Egbert Schroeer has let me know of his GitHub featuring Sidekick

Sidekick will keep 4 Model I NEWDOS/80 images in SuperMEM RAM, and allow you to hotkey between the four; essentially keeping 4 Model I's in RAM. Only the machine in the foreground runs.

You can grab it at https://github.com/Egbert-Azure/TRS80M1/tree/main/software/sidekick

David Shadoff was kind enough to provide some new JMS Stuff!

Egbert Schroeer has posted a copy of a very very heavily modified NEWDOS/80 v2.0 for the Model I, albeit in German.

• It adds a much larger and more structured extended library of commands, expanding NEWDOS/80 well beyond the original command set. The new/extended commands include directory tools, screen/HRG tools, printer controls, system-generation helpers, and utility functions such as DIRSORT, XDIR, ZAP, EDIT, COM, UNKILL, SYSGEN, REPORT, RESET, STOP, BANK, CALL, GO, IO, KEY, UM, ON/OFF, CLH, HI/LO, and ,./.
• It moves the extended library into a dedicated overlay layout, using SYS15, SYS22, SYS23, SYS25, SYS26, SYS27, and SYS28 for different functions instead of keeping everything in one place. That makes the system more modular and confirms where each major tool lives in the binaries.
• It adds SUPERZAP in SYS22, which is a full sector/file editor with NEWDOS error messages, copy-related functions, and direct HEX/ASCII editing support. This is a substantial upgrade for low-level disk repair and inspection.
• It adds XDIR in SYS23, an extended directory viewer with wildcard matching and paging behavior. That gives better directory browsing than the base system.
• It adds DIRSORT in SYS27, which can sort the directory alphabetically and rebuild the directory structure afterward. This is a practical maintenance improvement for keeping disks organized.
• It adds CLEAN and UNKILL support, so killed files can either be permanently removed or reconstructed for reorganization. That improves file recovery and directory maintenance workflows.
• It adds SYSGEN support that can generate a new system disk using the current PDRIVE parameters, and the binary shows it installs a named DOS build (DL9YAPDOS). This makes system replication and deployment easier.
• It adds COM macros, allowing predefined multi-step DOS command sequences to be launched quickly. The binary even contains real macro definitions, including one that runs a payroll BASIC program (LOHN187).
• It adds a screen editor in EDIT, with specific key behavior for insert, delete, and abort actions. That gives the system a more usable on-screen text editing tool.
• It adds printer and output enhancements such as REPORT and RESET, including configurable printer formatting data in SYS25. That improves printing control and compatibility with Epson-like printers.
• It adds high-resolution graphics support features in SYS28, including screen on/off, clear, and combined image saving/loading with ,./ and RD. It also detects disk format before printing the HRG screen, which improves reliability across different disk types.
• It adds the Umlaut driver (UM) and other German-language support, making the DOS more practical for German users. The binaries confirm the driver is activated with SHIFT-@.
• It adds utility commands for direct machine-level work, including CALL, GO, and IO. These make it easier to jump to addresses, start loaded machine code, and access I/O ports directly.
• It adds convenience aliases and shortcuts like PD, S, HI, LO, and related functions, making common DOS operations faster to type and easier to use.
• It includes a dedicated KEY function for defining custom three-key macros. That gives power users a way to create very short keyboard-driven workflows.
• It includes English on-disk translations in addition to the original German texts, which improves usability for readers of both languages. Those translation files exist in the DMK image alongside the original documentation.

You can grab it at https://github.com/Egbert-Azure/TRS80M1/blob/main/diskimages/NewDos/dos-versions/newdos80-weikamp-020387.md

User SHBLYTHE has found THE VALLEY by Computing Today magazine

You can grab it on GITHUB here

Egbert Schroeer has updated trsextract to includ writing!

You can grab the updated copy at https://github.com/Egbert-Azure/trsextract

Egbert Schroeer has built two tools — both native to the Mac:

• SDLTRS-Wrapper
  A real Cocoa window for sdltrs: machine presets, four floppy slots, four hard-disk slots, and ROM / config / character-set controls. It launches the emulator underneath with the right command line — it's a launcher, not a new emulator; the running window is still sdltrs. It fixes the disk-loading and configuration friction, not the in-emulator menus.
  Link: https://github.com/Egbert-Azure/SDLTRS-Wrapper
• trsextract
  A native, dependency-free reader and extractor for TRS-80 Model I NEWDOS/80 and G-DOS floppy images (.dmk, .dsk). Lists directories and extracts files byte-for-byte — no emulator, no Windows, just Python 3. Validated byte-for-byte against TRSTools extractions across single- and double-density NEWDOS and G-DOS disks. Includes an optional SwiftUI drag-and-drop front end.
  Link: https://github.com/Egbert-Azure/trsextract

Both are GPLv3

• The Internal Ports page has been updated with additional ports, both internal and from hardware add-ons.
• The Model 1/3/4 Disassembly page has been updated to link to the ports page when clicking on a port operation.
• Preliminary support has been added to the TRS-80 Software Archive Search page for patches. Where a patch exists, a new column, with an icon of a band-aid, will serve the download.
  This may take a while. The code is there, but it means I need to sort my patches and consolidate each program into a single zip. You can see the link in action by searching for LTERM or MODEM-80.

KiwiSinceBirth, who has done so much for the modern TRS-80 community, has created kDOS, a Model I Operating System specifically for those Model I owners running a Floppy 80 (expansion interface NOT required). He describes kDOS

kDOS is an operating environment that runs on the Tandy TRS-80 Model 1 providing a TRS-DOS (DOS) like features to Level 2 BASIC
The DOS runs alongside Level 2 BASIC, rather than supplanting it. Typing a DOS command and a BASIC statement are done in the same shell
Files are stored and accessed from SD card in a standard FAT filesystem. There is no emulation of TRS-80 floppy disk or hard disk drives, nor any TRS-DOS (like) file-system
There are no imposed file size limits, or limits on the number of files that can be stored, for a TRS-80 a modern SD card could be considered infinite storage. Directories are fully supported. Files copied to the SD card by modern computer, are directly readable on the TRS-80
Programs that run on TRS-DOS "should" run under kDOS so long as they use standard DOS API calls. Programs that directly access FDC hardware or undocumented (non-standard) API calls will probably not function, unless patched

The core features are:

• Modern Filesystem
  • Files are stored natively on the FAT filesystem
  • File directories (including nested) are supported
  • File storage space is unrestricted, can store any number of files
  • Automatic conversion of traditional filename/ext into filename.ext
• DOS Features
  • DOS commands are typed into the BASIC command shell
  • Most DOS entry points at $4400 are supported
  • Interrupts with real Time Clock supported
• BASIC features
  • Extended Basic functions are supported
  • Long error messages ar displayed
  • Disk File IO Statements are currently NOT supported
• Has a Low memory overhead than a traditional DOS
  • Requires about 0.5Kb of main memory space
  • Uses virtual memory from $3000-$37DF
  • 47800 Bytes Free, compared with 48350 on Level 2 BASIC
  • Memory from 4500H is available for application usage

You can get more information at https://github.com/kiwisincebirth/TRS-80-KDOS

Lawrence Kesteloot has released an updated copy of his trs80tools, now new version 2.8.10. He notes:

• Improvements to the disasm command: Disassembled instructions are now canonical when there are variants. For example, it will generate or b where it used to generate or a,b.
• Improvements to the asm command (and the IDE): The assembler now supports the alternate forms described in the zmac manual, except for the rst ones.

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

George and Peter Phillips have updated their awesome TRS80GP emulator to v2.5.7. Changes are:

New Features:

• Debugger disassembly also shows the last few dozen completed instructions
• Backtrace now tracks the last 1,048,576 instructions, up from 65,536
• Hard drives now implement write protect
• Windows debugger completely fills memory and disasssembly windows at start
• Z-80 single stepping now shows memory permission faults when single stepping

Bug Fixes:

• EMU hard drive images now correctly show CRC errors in disk summary
• Fix corrupted data CRC caused by editing EMU hard drive sectors
• Fixed audio corruption in .avi video recording
• File import: CP/M files are forced to upper case
• Fix crash when tracing memory from CWAI on 6809
• Reformatting DREM hard drives images will now update .cfg parameters
• File import: fix duplicate entries and Model II defaults to Program type
• Detaching second hard drive no longer detaches primary hard drive
• Hires graphics (-gt, -gg) can now be selected for Model 4D
• Backtrace no longer shows 64K bogus instructions if triggered at start

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

In this edition, George and Peter Phillips have an upgrade to their brilliant TRS-80 emulator, 'trs80gp'. Amardeep Chana shows us a cool and efficient M1 power supply. Terry Stewart finds some lost System-80 software - SCAP. There's a new game from 'Voidstar' - 'BEAST'. Ian Mavric has the latest updates for the Tandy Assembly 2026, helps decide if it shouls be LDOS or NewDOS80 and explains how to upgrade a Co-Co Mk1 from 32 to 64K. Seen the 'clockwork Pi' yet? The info's here. E.T.Fonehume explores the U.K.'s LSD curency, in use before decimalization. Mark Pruden breaks the 48K barrier. Another game from 'Nickman Studios' - 'House at the edge of the crater'.
Vince Otten has part 6 of his series 'The power of the ROM'. The 'Way We Were' looks at a program that writes programs. (Something similar, in the U.K., was called 'The Last One' I recall). There's a Countdown, numbers puzzle for you to try. (Not quite as easy as last time!).
‘Surfin’ The Net’ finds the '8-bit boyz'. And finally, I check out some of the recent UK Ebay bargains.

You can download it from http://TRS-80.org.uk/ or a repaired and OCR'd (as best as possible given the font selections) version with JSON and text sidecar here.

The new ROM Disassembly page project is at a close. Twenty TRS-80 Model 1/3/4 ROM versions are now supported.

Model /Revision	Year	CRC (ROM A B C)	Link Format
Model I v1.0	1978	AE5D DA84 4002	/sub-disassem-rom-m134.htm?v=m1v10
Model I v1.1	1978	AE60 DA45 40E0	/sub-disassem-rom-m134.htm?v=m1v11a
Model I v1.1 Revised	1978	AE60 DA45 3E3E	/sub-disassem-rom-m134.htm?v=m1v11b
Model I v1.2	1979	AE60 DA45 40BA	/sub-disassem-rom-m134.htm?v=m1v12
Model I v1.3	1980	B078 DA45 4006	/sub-disassem-rom-m134.htm?v=m1v13
Model III v1.0	1980	9639 407C 2B91	/sub-disassem-rom-m134.htm?v=m3v10
Model III v2.0	1980	9639 407C 2EF8	/sub-disassem-rom-m134.htm?v=m3v20
Model III v3.0	1981	9639 407C 2F84	/sub-disassem-rom-m134.htm?v=m3v30
Model III v3.0 Revised	1981	9639 407C 2F84	/sub-disassem-rom-m134.htm?v=m3v31
Model III German	1982	9639 407C 10E4	/sub-disassem-rom-m134.htm?v=m3vGerman
Model 4 - Standard Gen 1 60 Hz	1983	9639 407C 1591	/sub-disassem-rom-m134.htm?v=m4v10
Model 4 - v1 50hz Australia	1983	9639 407C 1587	/sub-disassem-rom-m134.htm?v=m4v1AU
Model 4 - Standard Gen 2 60 Hz	1983	8F46 407C 48BC	/sub-disassem-rom-m134.htm?v=m4v20
Model 4 - Network 4 Student Station	1983	8F46 407C 33CB	/sub-disassem-rom-m134.htm?v=m4vNetwork
Model 4 - v2 50hz Australia	1983	8F46 407C 48B2	/sub-disassem-rom-m134.htm?v=m4v2AU
Model 4 - German	1983	8F46 407C 3080	/sub-disassem-rom-m134.htm?v=m4vGerman
Model 4 - French AZERTY	1983	8F65 407C 43AD	/sub-disassem-rom-m134.htm?v=m4vFrench
Model 4D - XDROM v3.33 (with Diagnostics)	1990	8F46 407C 5C1D	/sub-disassem-rom-m134.htm?v=m4vXDROM333
Model 4 - XROM v3.33	1990	8F46 407C 5C1D	/sub-disassem-rom-m134.htm?v=m4vXROM333
Model 4D - XDROM Diagnostic 1.1	1989	8F46 407C 5C1D	/sub-disassem-rom-m134.htm?v=m4vXDDiag11

Since the prior announcement, additional changes have been made. The new ROM Disassembly page now features:

• Option to show Z-80 Mneumonic with Hex, Z-80 Mneumonic with Labels, Z-80 Opcodes, and/or original 8080 Mnemonic
• Ability to enable or disable 6 different types of notes, including original source code notes. Original source code notes will either be the Gates/Allen source code, or the Frank Durda IV source code for routines added onto the Model I v1.0 for the Model III
• The page permits viewing 5 Model I ROM versions, 5 Model III ROM versions (including the German ROM), and 7 Model 4 ROM versions. To open the page to any specific disassembly
• Additional routine header commentary has been added
• The page has been optimized again.

When I was updating the Model III page based on the original source code, correcting a whole lot of errors in the process, I realized that the Model I page, which was the first diassembly done, had a LOT of flaws: Typos, bad jumps, etc.

What I decided to do was to take all the work I had just done on the Model III and back port it to the Model I page, but to include the original labels, the original 8080 source code and comments by Gates/Allen, and options to use labels or hex.

So the new page will generate based on the 5 different Model I ROM versions, and then you can choose whether your want Hex or Labels (or both), the Z-80 Opcodes, the 8080 Opcodes, and you can customize up to 5 different types of commentary.

The result is a web page which is built on the fly based on user preference through check boxes - albeit a 3MB page, so a touch of patience is required for your browser to build the page per your specifications.

The new page is here

Lawrence Kesteloot has released an updated copy of his trs80tools, now new version 2.8.9. Updates are to the DISASM command as follows:

• No longer automatically specifies Model III ROM entry points when disassembling a ROM since the ROM might not be for a Model III.
• When specifying the --no-labels flag, jumps to the current address will list the address and not the $ symbol.
• Data now uses DEFB instead of .BYTE.
• Disassembly warnings are now sent to standard error instead of standard out.

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

Thanks to David S, I am told that Jens Guenther has updated his Windows/Linux fork of the SDLTRS Emulator to v1.2.35

Changelog:

• Added memory size selection for TRS-80 Model I/III.
• Added CPU clock rate option for selected TRS-80 Model.
• Fixed TRS-80 Model 4/4P character display.
• Fixed bugs and internal improvements.

You check it all out at https://gitlab.com/jengun/sdltrs/-/releases

I have finished two new pages dealing with the Model III Addresses/Official Labels:

• RAM Addresses

These projects also allowed me to make adjustments and fixes to the Model III ROM Disassembled pages both in terms of small errors and by adding some checkboxes to streamline viewing.

Diane Kester has provided a the Student Manuals! Thank you, Diane!

The next TRS-80 Trash Talk live show is Saturday, May 23, 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.

Pascal Holdry has provided the manual for the Macrotronics M80 Ham Interface! Thank you, Pascal!

A page discussing MicroDOS has been added. The page includes some historical background, an online manual, and a disassembly of the "DOS" portion.

Tim Mann has provided a bunch of VTOS manuals! Thank you, Tim!

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

Catalogs

Hardware Manuals

Service Manuals

Software Manuals

Tandy Memos

Largely because the TRSDOS v1.3 BASIC project left me with a lot of labels which were missing, I have now gone through the Model III ROM Disassembly and have redone all of the labels.

I started with the original PDP-10 source code for the Model I written by Gates/Allen and tracked down the corresponding Z-80 code, using their labels.

Then, for code which was changed from the Model I to be Model III, I used Frank Durda's source code to track down those remaining labels. Thankfully, for the overwhelming majority, Frank decided to keep those labels.

Voidstar has release a new game for the TRS-80 Model I and III called BEAST. He writes about its origin:

This was kind of an accidental project. I never messed with 2x3 semigraphics, and I wanted to demo about it using the POLY-88 (since it's that systems 50th anniversary this year) at VCF next month. Well, its VTI video card is having some issues now. So - I figured how hard could it be to port the 8080 code and 2x3 semigraphics over to the Z80 and the TRS-80's 2x3 semigraphics? Well, it was an adventure - the POLY-88 at least has a 60Hz timer for RNG and tempo-timing. I aimed to support a TRS-80 M1 without an Expansion Unit (since that's all I have in real hardware). But thanks to help with some folks, I went ahead and made the binary/CAS/WAV/CMD compatible with both the M1 and M3 (sorry M2's and M4's!). I do this by probing for the M3's timer clock first. Anyway, it matches the POLY-88 version. There is a README TEXT (and source) in the ZIP for more instructions.

You can watch the game play at https://www.youtube.com/watch?v=k7GsxYuFI3o

The GITHUB is at https://github.com/voidstar78/BEAST/tree/main/TRS80_VERSION

• Thanks to a program writing by Gemini, I have gotten JSON OCR from Mistral for all 7,963 zips in the 'publications' folder, although a few PDF's had to be regenerated. I have looked at the output, and it is by no means perfect, but it is orders of magnitude better than what was there from either AABBYY Finereader or Adobe Acrobat Pro.
  UPDATE: At this point, I have re-uploaded all downloadable PDF's and every one of them should have the .json and sidecar.txt in it. I am, however, starting the "Phase 2" of creating PDF's with the Mistral OCR replacing the existing OCR, and the files will be re-uploaded once that occurs.
• A site visitor Airton was kind enough to point out that there are discrepancies between the Level 1 source in github, his work on the Level 1 source, and the Level 1 disassembled page here.
  UPDATE:The page has now been corrected.
• Downloads for Level 1 programs have been fixed, thanks to Quentin pointing out that they were not functioning.
• The TRSDOS v1.3 disassembly re-do project is winding down. All 15 SYS files have been reprocessed against Frank Durda's source file. I plan on doing BASIC/CMD as well to finish up the set once the credits refresh. I also realized that XFERSYS was never disassembled, so that will be on the to-do list as well. I wish all the background information and files required to do these didn't use up so many credits.

The first, which I am 2/3 of the way through, is updating the TRSDOS v1.3 disassembly pages to merge in the official Frank Durda source code labels and comments. This is tough going because of misformed pages to begin with. It also uses a ton of credits because I have to feed in a disassembly, the HTML (which is about 500MB each), and all of Frank's source and dependencies.

The second, is to re-OCR the documents. There are currently 7,963 zips in the 'publications' folder. The process uses cURL to upload the PDF to the Mistral API and retrieve a unique file ID, which is then passed to a PowerShell script to trigger the OCR model and generate a text sidecar, which is then used by OCRmyPDF to inject a searchable text layer back into the original document. During this final assembly, Tesseract performs a local OCR pass to handle any missed coordinates and refine text placement, while Ghostscript acts as the rendering engine to optimize the PDF's internal structure and compress the file for archival storage. Mistral is utilized because it employs the new Vision-Language Model (VLM) that is better than the basic pattern-matching of legacy tools by using deep contextual understanding to accurately "read" and reconstruct text even through the heavy noise, dot-matrix distortion, and ink-bleed common older publications. It is possible that the JSON can be used for indexing the archive's full-text search engine or programmatically extracting metadata from the magazines.

Nickmann Studios has developed a new game for the TRS-80 - "House on the Edge of the Crater"

The authorities of the age of normality have exiled the most creative people to the moon: artists, scientists, dangerous eccentrics, and keepers of great secrets.
You are Yordi, the reporter.
Conduct interviews with the residents, explore the house on the edge of the crater and bring back to earth the knowledge that could transform the cold world of the age of normality.
Based on the novel house on the edge of the crater by István Nemere and Gábor Képes.
Requirements for a successful mission: Conduct 9 interviews and obtain all 3 keys.

It is a 'name your price' download - You can find all the information and download links at https://nickmann-studio.itch.io/crater

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

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

Software

• Aerocomp Hard Disk Driver Boot Disk Creation Instructions
• AIDSPLUS-II with AutoKey v1.0
• ARC31 v2.00
• Auto-Mate v1.0
• Back-Rest Fast Hard Disk Backup
• Beep
• BSORT and MOD324
• ConvCPM v2.0
• Describe
• DiskMod EDTASM
• DISnDATa v1.0
• FileAid for AIDS Plus-II
• FM File Manager
• Formation Forms Management System
• Hard Disk Backup
• Home Accountant
• Le Script v1.2 Manual C
• Little Brother 86 Installation Manual for MSDOS
• Little Brother Database Manager Installation Manual for LDOS
• Little Brother Database Manager Installation Manual for Model 4
• Little Brother Database Manager Supplemental Documentation
• LS Comp
• LSI Help System
• LS QFB
• LU4 Library Utility v1.40
• LUM3 v1.23
• LUM4 v1.13
• LUMN3 v1.01
• Mach2
• MARC4 v2.01
• Montes Toolkit
• Montes Window
• Montezuma Micro 15MB Hard Disk Support
• Montezuma Micro CPM v2.2 Update to v2.3
• Montezuma Micro Public Domain Disks
• M-ZAL Compiler
• NEWDOS-80 v2.0 for Model I
• NSweep
• Nulu v1.1
• OverDrive
• Pro-ESP
• PRO-ZGraph
• Re-Vise
• SQ3 Squeeze v1.01
• SQ4 v1.01
• Sweep4 v1.00.00
• TBUG Z-80 Monitor and Debugging Aid
• Toolbelt for TRSDOS 6.x
• USQ3 v1.01
• USQ4 v1.01
• XARC4
• X-FTS File Transmission System
• XPort File Transport Utility v1.0
• XT-4 v1.6.8

Flyers

Radio Shack Memos

Hardware Guides

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!

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.

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.

• 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.

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

• Clefs Pour Le TRS-80 Modeles I et III Tome 1
• Clefs Pour Le TRS-80 Modeles I et III Tome 2
• Desktop Plan-80
• TRS-80 Model III-4 Handleiding Betreffende de Werking en de BASIC-Programmeertaal
• Handleiding Voor Level 1
• TRSDOS and DISK BASIC Handleiding
• Handleiding voor BASIC Level II
• DMP-110 Operations Manual

Thank you, Cris!

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

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