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 http://www.trs80trashtalk.com/.

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 https://github.com/calphool/TRS80HDD. He advises that all parts are currently attainable at Mouser Electronics, the edge adapter from DigiKey, and the schematics can be sent to allpcb.com 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 https://github.com/calphool/TRS80GS.

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.