March 8, 2019 – Site Update

I finally bypassed the bug that was keeping product advertisements from showing up when clicked on the Software search results. I am now going through all the catalogs I have, and am trying to add as many ads/catalog entries as I can. This includes a foree into listing items which are missing from the archive.

March 6, 2019 – Updated TRS-80 Emulator

George and Peter Phillips have updated TRS80GP to v2.1.0

Changes include:

•  Better handling of floppy (formatting is the biggest)
•  .cmd files now loaded under TRSDOS/LSDOS rather than ROM BASIC.
•  Sound mute menu entry and auto-muting paused or using menus.
•  Full screen and new sharp rendering mode. (perfectly square pixels with scaling)
•  Reassigned and new hot keys
•  Disk files recognized by .dmk, .imd, .dsk suffix so can be listed without -dN on command line. Or with just -d if suffix unknown.
•  Can insert unformatted blank disks with “-d dmk” and “-d imd”.
•  Printer menu to turn off pop-up and turn off printer (also -poff).
•  Reset button and RAM badge added to soft keyboard.
•  Added IM mode, WZ register, EX latches and Z-80 instruction state to debugger.
•  BASICG and hires graphics utilities now on built-in Model II TRSDOS boot disk.
•  Handling of reset button and HALT instruction fixed on Model I.
•  Clock automatically set for Model 1, 3, 4 built-in TRS-DOS, LDOS and LSDOS.
•  Added -is, -ics, -id, -itime, -im trackdump and -showframe for automatic input “scripting”.
•  Add “Replace” to diskette menu for quicker eject + insert workflow.
•  Now have -m3n for Norcom emulation (99% just a different character ROM).
•  Bug fixes in screenshot when paused.
•  Beam debug now defaults to blue for conflict colour and shows the data that would have been displayed if the conflict did not occur.
•  Built-in Model 4 LDOS now configured for 4 floppy drives (it had only 2).

Learn more and get it at

March 5, 2019 – New TRS-80 Trash Talk Podcast

The podcast TRS-80 Trash Talk # 29 is out now.

In this episode, In this episode, Peter Cetinski talks with Steve Leininger. Steve was the designer of the first TRS-80 microcomputer which became known as the Model I. In the interview, Steve talks about his early life and how he came to be hired by Tandy Radio Shack to design their first computer in 1976. He tells us what it was like to work at the fabled company with a number of interesting stories, many of which you you probably haven’t heard before. Then, he finishes up by discussing what he’s been working on since leaving the company up until the present day.

You can download or listen at

March 4, 2019 – New Issue of TRS8Bit

Dusty has released the March 2019 issue of the TRS8Bit newsletter on the download page of his web site.

Page 03 TRS-80 8MB Hard Drive Three Wire Fix Peter Cetinkski
Page 08 TRS80GP – New Version v2.1.0 George Phillips
Page 10 Splicing Paper Tape Bill Degnan
Page 13 In Mav’s Workshop
TRS-80 Printers Part 8
Colour Printers
Ian Mavric
Page 26 Magic Squares E.T. Fonehume
Page 28 Model I Hardware Developments Joe Rounceville
Page 30 For Sale And Wanted
Page 31 In Mav’s Workshop
Building Your Model I Power Supply
Ian Mavric, Dean Bear And David Mutimer
Page 36 Stop The Drop E.T. Fonthume
Page 38 Virtual Floppy Boogaloo
Gotek For A M3
Kyle Wadsten
Page 45 In Mav’s Workshop
Journey To F48, a Frehd For 8″ TRS-80’s
Ian Mavric
Page 52 Trapped Knight George Phillips
Page 56 Review Of ‘x-bas’ For The Aculab Floppy Tape Adrian Hancock
Page 64 U.K. Ebay Bargain
Did You Miss Them?
Page 66 TRSnic Peter Cetinski
Page 73 ** Hooj-toons ** The 2019 Competition
Page 75 News From Ira’s Ira Goldklang

February 14, 2019 – TRS-80 Network Interface Card

Peter Cetinski has been working on a project that provides a simple, cheap, WiFi based, encrypted Internet communications via the TRS-80 by connecting to the Model III and Model 4 expansion port.

TRSNIC provides the foundational protocols required to implement modern network interactions on the TRS-80 microcomputer. The first such protocol provided is TCP/IP via an implementation of the Berekely Sockets API. TCP/IP is the dominant low level network protocol in use today. Many of today’s higher level network protocols like HTTP and FTP are implemented on top of TCP/IP. This means many modern networking applications and systems can be built upon the base TCP/IP support provided by trsnic.

You can read more about it a here and here.

February 12, 2019 – New TRS-80 Trash Talk Podcast

• The podcast TRS-80 Trash Talk # 28 is out now. In this episode, the Trash Talkers discuss how to buy and sell TRS-80s. Using their wealth of knowledge about the Tandy collector’s market they go in-depth on tips and techniques to use at live auctions, eBay, Craigslist and other marketplaces. Whether you’re buying, selling or doing both, you’re likely to learn quite a bit from their experience. You can download or listen at

January 29, 2019 – Screenshots Added

After almost 5 (!) months, I have completed preparing a relevant (or as relevant as it can be) screenshot for every single entry in the Model 1/3/4 archive. That is over 17,000 screenshots. This entailed running every single program to make sure it worked; a task made difficult by the fact that different programs run on different models, and different DOS’s, and may even be a different version of BASIC (ZBASIC, NewBASIC, GBASIC, BASICG, SuperBasic, etc). It was a project long in the coming.

I would like to give a special shout-out to George Philips for tweaking his TRS80GP emulator to assist in this effort.

Along the way I have found out things like:

•    Some Model I DOS’s toss the last line when reading a file saved in ASCII
•    TRSDOS and LDOS for the Model 4 are not simply the same OS
•    Model I TRSDOS does not support batch files
•    Model I LDOS requires a trailing slash when there’s no extension, making it largely incompatible with all multi-part programs
•    MultiDOS for the Model 4 has a special BASIC which can properly de-tokenize Model I/III BASIC
•    LDOS for the Model 4 has a special USR(11) function
•    There’s a whole class of software written for the Model III that can only run on a Model 4
•    Statements like INPUT@ and CMD"O" means its probably DOSPlus
•    Statements like #GSUB or LINE a,b,c,d,SET or SOUND 4 or PGET or GPOINT x,y or INV a,b,c,d means its probably NEWBASIC
•    Statements like BREAK or x=SYS(12) means its probably BEYOND BASIC
•    Statements like EDIT(10,20,30) means its probably ZBASIC
•    Statements like @CLS means its MODEL 4 Micro Labs GBASIC
•    Statements like &CLS means its MODEL III Micro Labs GBASIC
•    Statements OUT 129 through OUT 131 means its Micro Labs GBASIC
•    Statements like CLR, GLOCATE, w{P, W&C 0, N/UM (x,y), LINE (x,y)-(a,z),0, PRINT#-3, PAINT, or VIEW means its probably BASICG
•    Statements like INC ALLOCATE BRKON EXIST$() and PLOT x, x,y to x,y and S,0,0 TO 127,Y means its Enhanced BASIC by Misosys/Philip Oliver
•    Statements like CMDClear and CMDGet means its Graphics-90 by Software Affair
•    Statements like BLINK, HIMEM, DPOKE, GLOAD, GSUB, GTO, PON, REPEAT, or SOUND a,b,c,d,e means its NEWBASIC by Modular Software Associates
•    Someone a lot smarter than I needs to figure out how the programs which POKE USR routines can possibly work in DOS
•    Model 4 Communication Programs usually need SET *CL COM/DVR run from the TRSDOS command line first
•    The LDOS command to set up a ramdrive in DCT format is SET (DRIVE=4,DRIVER="MEMDISK/DCT").
•    /APP files are for PRO-WAM
•    Misosys catalog program names are not the same names used in the program (i.e, “Pro-Duce” is really “Misosys Disassembler”)
•    People LOVED to put their names on other people’s software (or remove the attribution lines)
•    TRS80GP can do everything that Dave Keil’s DOS emulator’s could, but without needing to run DOSBOX!

January 24, 2019 – TRS-80 Add-Ons

Joe Rounceville has been designing and building peripherals for the Model I which he wants to share with everyone.

First is TRS80HDD. It is a way to run TRS-80 Model I disks from a SD card. Similar to a MISE but far less sophisticated. Schematics, instructions, and background can be found on his GitHub repository He advises that all parts are currently attainable at Mouser Electronics, the edge adapter from DigiKey, and the schematics can be sent to for creation of a PCB.

Second is TRS80GS. It is an expander for a TRS-80 Model that includes Texas Instruments video and audio chips to permit the Model I to do color graphics and have 6 tonal voices and 2 drum voices. It also supports Atari/Commodore joysticks. Schematics, instructions, and background can be found on his GitHub repository

Thanks for keeping the TRS-80 alive, Joe!

January 10, 2019 – TRS-80 Manuals and Magazines – Free for local pickup or the cost of Packing/Shipping


A site visitor located in New Braunfels, Texas (central Texas, between Austin and San Antonio), has a bunch of magazines and original manuals to give away to a good home. Free for local pickup and he is willing to ship if you pay the cost of packing and shipping.

I will relay messages sent to me in the order received. First come first served.