For Branching Out, the Apple ][ website, click HERE.  

TRS-80 gallery of user's machines is at the bottom of this page.  Updates for 10/1/18: Coco Page

My email address:

Links for people who want to buy TRS-80 stuff from me:

Model I        Model III        Model 4       Model 100         Coco        Tape/Floppy/Hard Drives        Software/Books/Mags     Garage Sale     New stuff  Chips/Bits      FreHD Emulator     System 80      Downloads      Hi-Res Graphics     Rietveld        FreHD Clearly Superior Package Deals


The Right Stuff

 (This is my TRS-80 Universe site - 10th January, 2018 update)

Ian Mavric - Australian TRS-80 Recycler

Hardware support for TRS-80 Model I/III/4, Coco 1-2-3, Tandy 2000 and Tandy MS-DOS semi-compatibles and accessories:

* Buying and selling Tandy and TRS-80 computers or parts thereof

* Repairs and upgrades to TRS-80 computers (where possible)


* DOS boot disk and software supply for replacement or worn out original disks - see below.

* Consignment sales of TRS-80 equipment

* Items sourced from the USA for collectors - TRS-80 items not released in Australia a specialty

Got a Tandy or TRS-80 system (any model) you wish to dispose of?  Drop me an email and I’ll be in touch within 24 hours!  Whether it works or not, or even if its not complete, I'm interested.


Contact: Ian Mavric of Melbourne, Australia.

Phone: (613) 9390 0797 or 0416 184 893 or E-mail:



Added 1st January, 2018

RE-FD502 controllers back in stock (Kit and Assembled)

DSCN1576 DSCF4925

Experimenters 2764 cart


Diagnostics cart 2.0

DSCF6252 DSCF6254

See the Coco page for more details.



Tandy Assembly 2017 was a roaring success.  Regularly check in on the T-A web site to see what they organised for 2018.

For more information, go to: Tandy Assembly web site



FreHD Picture or Video 021 Package Deals

(Released 25th March, 2016)


A series of plug-in and use FreHD products which includes cables, power supply, and anything else needed in the box.  Compare it with similar products, you'll see that FreHD is Clearly Superior.


"Quinnterface" Mini Expansion Interface for 16K Model I FreHD users!

(Released 1st December, 2015)



Neat little device is perfect for Model I users who own a 16K Level II unit (which is most of you) but no EI or Disk Drives, and don't want to modify your Model I with upgraded boot Rom or memory upgrade.  The Quinnterface, developed by J. Andrew Quinn from New Zealand, adds 32K RAM and auto-boot functionality to your FreHD.

For a video of how to set up and use the Quinnterface, click HERE.

Only $USD95.00!



"Improved Grafyx for the Model 4"

Finally!  A hi-res graphics board for your Model 4/4GA/4P/4D!

(Added 4th April, 2015)

This is my new hi-res graphics (HRG) board based on the old µLabs GX 4.2 board which has been unavailable since the late 1980s.  This one utilises an updated design with fewer chips, smaller footprint, while still having a 25% performance increase over Tandy's HRG.

This great new device works in all Model 4 and 4Ps: Only $USD99.00! ($A165.00)+shipping.



For a video of this HRG in action, click HERE.



A small neat enclosure for your FreHD!

(Added 1st January, 2015)

The FreHD is sold as a naked PCB which allows end-users to mount the device any way they like... inside the TRS-80, in a box, or just leave it a naked PCB on their desk.  People who like a simple solution asked if I could recommend a small, neat, sturdy box for their FreHDs, that didn't cost the earth.  I finally devised once which I now call the FreHD BoHx for $30+shipping which includes all the hardware needed to mount your FreHD.


"For those who would like to make their own and save a few dollars, I'll be writing up a project on the BoHx in the next issue of TRS8Bit." - Ian.


More info on the FreHD Emulator page.



(Added 29th June, 2014)

Due to the hard work of the FreHD team and Dean Bear in particular, the Model I version of the FreHD auto-boot EPROM is in beta test phase.  It's a major upgrade to your Model I system but if you can solder and add a small switch auto-boot is now within the reach of the most dedicated TRS-80 enthusiasts - the Model I owners.

This video shows the auto-boot Model I in action.


More info on the FreHD Emulator page.



(Model III/4)

(Added 6th April, 2014)


This special Kit is for owners of TRS-80 Model III and 4 diskless systems (catalog numbers 26-1062 and 26-1067) and comprises of a FreHD, SD card with starter images, Special Auto-Boot EPROM, special power cable, Hard disk interface cable, and information CD.  NOTE: you will need to open your TRS-80 and install the new EPROM and plug in a cable.

More info on the FreHD Emulator page.



(Model III/4/4D)

(Added 10th November, 2013)


(Model I and 4P to follow soon)

The FreHD team are pleased to present a new product which greatly simplifies the start-up of FreHD-based TRS-80 Model III, 4 or 4D.  A reprogrammed EPROM replaces one inside your computer, and with firmware update to version 2.13 (see below), and a small program on your SD card called frehd.rom your FreHD boots to a menu which allows you to choose which DOS you with to load off the SD card and run.  Goodbye to unreliable boot disk!  More info on the FreHD Emulator page.


SD Card HARD DRIVE Emulator for Model I


(Added 18th August, 2013)

I am pleased to announce that after much work by Fred Vecoven, Andrew Quinn, Dean Bear, Brett Paulin, Ray Whitehurst, Frank Galphin and myself, FreHD is finally approved for production for use on the Model I computer.  Cheap, limitless storage Tandy's original computer is finally a reality.  FreHD for the Model I comes with LDOS 5.3.1, and is compatible with your double density board (Tandy or Percom), lowercase and double sided disk drives.  Just plug it in and boot off the supplied DOS diskette and you are away.

For a video of FreHD running on a Model I, click HERE.


Model 1 Hard Drive Adapter

(Added 20th July, 2013)

This great little device connects a TRS-80 primary hard drive or the FreHD emulator to your TRS-80 Model 1 computer!  Unavailable since 1983, Tandy used to make a small adapter to connect a hard drive to the Model 1.  Extremely rare these days and when they do come on the market, grossly overpriced, I decided to get some made up which I will now sell for only $50ea.  Comes with a small cable to connect to the Expansion Interface, and I will email you drivers which will work with your TRS-80 primary hard drive.  If you need the hard drive cable, see the New Stuff page, but if you are using your primary drive or FreHD on a Model III/4/4P or 4D then you can use that cable - it plugs straight into the adapter.



SD Card HARD DRIVE Emulator for Model III/4


(Updated 28th June, 2013)

I am pleased to announce that I will be doing the assembly and worldwide distribution of Frédéric Vecoven's Hard Drive emulator kit for the TRS-80 Model III/4/4P/4D, "FreHD".  The best description of it is that its a small circuit board which the TRS-80 sees as a hard drive, and uses an SD card for memory.  As far as the TRS-80 is concerned, it is connected to a regular Radio Shack hard drive.  For more information on the development of the device, see Fred's web site HERE.


I'll be selling the kit in three forms, Kit A, B and C as well as individual parts and cables as needed to get you up and running.

50 have been sold to date, and a new consignment of PCBs has just arrived.  Order yours now!

Prices for each will can be found NOW on the FreHD Emulator page HERE.



(Added 7th April, 2013)

One of the regular questions Ira and myself often get asked is what can be done about the Model 1 power supply.  Lots of people are obtaining their Model Is from places like eBay, CraigsList and GumTree, or inheriting them, finding them at garage sales and flea markets, often without the power supply.  If you have an Expansion Interface the problem is twice the frustration because you need two power supplies to get the machine running.  Also the fact is that the original power supplies are pushing 35 years old now, and some are wearing out or are just plain broken.  There needs to be a solution for those who need a reliable Model I power supply unit, capable of powering both the M1 and EI, assembled from standard parts. 

We asked Dean Bear, TRS-80 enthusiast in Canberra (see pics of his TRS-80s in the Gallery, below) to design a simple but effective Model I power supply which can be made from standard parts available from any electronics shop, and he has delivered on a design which comes through with the goods!  I will be making and selling these - see the New Stuff page - in both 240V and 120V versions.  I may even offer them in parts or CKD form for those capable of assembling their own electronics projects.


A more expanded discussion of the project will be featured in the September 2013 issue of TRS8Bit newsletter including theory of operation, schematic diagram, PCB artwork, and assembly notes.  For more info as of this very moment, see model I power supply page. - Ian.




(Added 22nd Dec, 2012)

It's come to my attention from a few of my regulars that a lot of people watch this site looking for newly-listed items hoping that something they have been looking for for a long time shows up.  While this may happen, its also possible that I already have the item on hand and just have never thought it list it here.  I have literally hundreds of small items, software, spare parts and accessories for TRS-80s, not just what is listed here.  In fact if I were to try to list everything on this site and update it as things come in and go out it would be more than a full-time job. 

So by all means, if you are after some weird accessory for your Model III or a special game tape for your Coco, or anything in between, then ask me.  If I don't have it I may suggest you go on a waiting list here for said item, you never know when I might see it in my travels.  This also goes for systems not listed on this site and hard drives.



(Added 24th June, 2012)

More and more people from outside Australia have been finding my little web site here and have been asking me about the possibility of sending my items to them in other countries?  The short answer is YES, anything is possible.


The longer answer is that please bear in mind that Australia is a long l-o-n-g way away from most other countries (except perhaps New Zealand) and so shipping even small items will cost a considerable amount.  Blame Australia Post, or Fedex, or UPS or whoever you choose to use - they set the shipping rates not me - I merely quote what they tell me the cost to send is... that is to say, I make no money on shipping.


In recent times people from Japan and France have asked me about sending a Model III to them, Fedex quotes me $A470 to Europe or $A430 to Asia.  Someone asked about sending a Model 4D to the UK and it was also $A470 with Fedex.  Needless to say none of these people went ahead with the purchase.  People from the USA often ask me about buying and sending items to their country which makes my mind boggle; this is where all the Tandy/TRS-80 hardware originated from so wouldn't it be far more plentiful in the US than here?  Any savings made by buying from me would surely be eaten up by the postage costs?


However if you are in the US and are really desperate for a computer or part  thereof, I'm happy to help out, but just be mindful of the shipping costs, as I say, its a long l-o-n-g way my stuff has to go.



I now do the Australian and New Zealand arm of the REQUEST REAL DOS DISKS feature of the US web site.  If you have an old TRS-80 and need a DOS disk to see if it still works, drop me a line and I'll supply a DOS disk for the cost of postage.  (Applies to Model 1, 3 and 4 DOSes - Model 2/12/16 maybe in the future, but if you have one of these 8" systems by all means contact me to source DOS boot disks from like-minded individuals.)



(Added 28 July 2012)

I just saw a great video on YouTube the other day in which a gentleman who goes by the name of Vintage Volts, and shows a method of connecting his Tandy TRS-80 Model 4D to a PC via its RS232 serial port and transfer software downloaded from the Web to use on a real TRS-80.  I thought this was a very handy video as one of the most popular questions I am asked is how to get software from the Web onto a real TRS-80.  This method applies to any TRS-80 model fitted with a serial board, and works pretty well.  I've tried it with my Model I and 4P and it does work if you follow all the steps.

NOTE: the video is long (over 38 minutes), and extremely detailed, and aimed at a non-technical audience.  The flip side is that technical type people may need to skip through various parts but do that at your own peril lest you miss an important point which prevents successful transfer of software to your TRS-80.  Enjoy the video, and if you need an RS232 serial board for your Model I/III or early Model 4, drop me a line.

Vintage Volts Video - Episode 1 - TRS-80 Transfer



(Added on 11 Feb 2012)

Some of you may have noticed I'm on the list of TRS-80 repairers on Ira's web site and I've had a good response from people who have sent me their machines.  Of the 3 people who have contacted me and sent 4 systems (as at 11th Feb, 2011) only one system (a Model 1 keyboard unit) was too far gone and needed a motherboard replacement.  This is a pretty good hit/miss ratio considering the age and history of the equipment in question.  Some people have asked me what's actually involved.

1. First you email me and tell me what's wrong, I may request a screen photo before taking a look so I have some idea of the complexity of the problem.

2. You send me the computer and I set it up on my workbench and check it for obvious problems like corroded wires, moisture damage, physical damage etc.  I power the machine up and spend up to an hour with a logic probe, CRO, and multi-meter to try to determine why the machine doesn't work.  I don't charge for this service, its part of the quoting process.  (If I quote on repair and you think its to high/not worthwhile, then I'll just send your computer back for the cost of postage.)

3. I quote you for the repair and state how long I think it will take and which parts and how much those parts will be.  The quote is not fixed, I may find other parts needs replacing once I get to work on the machine proper, or find it takes longer (or sometimes shorter) amount of time to complete the job.  On occasion I find a machine that even if I think I can fix it, in might find later that its just too far gone and can't fix it.  In this instance I just tell you No Charge, can't fix it.  Due to the age of the systems this does happen from time to time.

4. The computer is repaired, set on a 24-hour burn in on my workbench then advised the total cost with itemisation of parts replaced. Your computer is sent back in the same packaging you sent it to me in.

5. I warranty all my work for 90 days but in reality it only covers the parts I replaced, so lets say I replaced a 74LS00, 74LS367, 4116 and a 2102 in a Model 1, if those parts fail then I'll replace them.  The age of TRS-80 systems means it possible that other original components could fail but in reality old TRS-80s are very robust machines and often my repaired machines hang in their for many, many years.  (My own personal Model III, for example, needed a chip replaced in 1990, and the computer is still in use, virtually every week, and not had a problem in the past 22 years.)



(Added on 11 Feb 2012)

"Literally blew up my TRS-80 when I connected the power to my video port -
snap, crackle, pop and smoke! But Ian was able to fix it.  Another Model I
saved and restored to working order - many thanks!" - Ian Robertson, Adelaide SA.

"As a TRS-80 enthusiast, Ian’s TRS-80 restoration service has been utilised by me on numerous occasions with outstanding success on each time.  This Australian TRS-80 recycler has the skills & knowledge to repair your TRS-80, my experience with Ian comes highly recommended." - John Benson, Lismore NSW.

(Added on 16 December 2012)

"dear ian. I've now got three packages. trsdos and other disk are OK. I thank you again, am very happy that everything works. I now try wede, small write programs (basic II). thanks for the games. love greetings walter" - Walter Shrauder, Wien, Austria.


"There aren’t many individuals on the planet who could have pulled this off.  Thank you again for repairing my hard drive.  It was worth getting out of bed this morning. Bob B." - Bob Boyd, PA, USA.



There has been some discussion on Vintage Computer Forums about the dangers of shipping poorly packed TRS-80s - they rarely arrive in one piece if not packed properly, and this is especially so for the Model III and 4.  Some years ago CN80 published articles on how to properly pack these computers for transportation.  Click the links below to read the articles in their entirety before sending me your equipment for repairs or sending machines to each other:

Shipping Your Computer


Shipping Diagram



I now sell three different types of TRS-80 Model I/III/4, and thought I'd take a moment to explain the differences:

1. AUSTRALIAN DELIVERY: these are computers originally sold by Tandy Electronics chain in Australia and are 240V/50Hz operation, and the sticker underneath states "Tandy Electronics" and 240V/50Hz operation.  On Model III and 4 they have a removable IEC (mains) power cord.

2. US DELIVERY: these are computers originally sold by Radio Shack and Computer Centre chain in the United States and are 120V/60Hz operation, and the sticker underneath states "Radio Shack" and 120V/60Hz.  On Model III, 4, and 4D the power cord is built in and dangles out the back - this is normal.  These machines require a cheap 120V Step-Down converter to run, and they work perfectly well.  (For other details on US Delivery machines, see the section below "WHY BUY AN AMERICAN COMPUTER?"

3. AUSTRALIANISED-US DELIVERY: these are 120V US computers which I have converted internally to 240V operation and have an Australian plug on the end of the usual US dangly power cord.  A sticker under the computer states that the computer is now for 240V use.  They don't require a 120V Step-Down transformer.  These Australianised-US computers will be listed in with the Australian computers, but clearly marked as such.



I usually only put 1 or sometimes 2 pictures of up the systems I am selling, even when I eBay them I only put 1 or 2 photos BUT that's not to say I don't have many more pics of each system.  If you are interested in a machine and need more photos, by all means ask.  I can normally email you photos within 12 hours of asking. -Ian. 



As you can see from this web site, I carry a lot of equipment imported from the USA.  Why would you be interested in an American unit?  Basically the rules of supply and demand mean that I can get them more readily in the US than in Australia, and I can sell them cheaper than comparable Australian units.  "Australian Delivery" TRS-80s (mean TRS-80s manufactured in Fort Worth, TX to Tandy Australia / InterTAN specs) sold in relatively small numbers compared to their American brothers and are very hard for me to locate in Australia and are usually in poor (ie. high mileage) state requiring complete rebuilds by me in order to sell them.  US units, on the other hand, have often had much less use and need less work by me to make them ready to sell, so I can ask less for them.

Australia delivery machines should probably be left unmodified for posterity and I encourage anyone buying a TRS-80 to modify it with the myriad of customisations out there to consider attacking a US machine with your soldering irons rather than local machines.  But that's just my opinion.  Of course US machines can in some cases be upgraded to Australian 240V power supplies for a cost, but I have found in my experience that those cheap 240-120V Step Down converters you can buy on eBay work very well.  My own workshop has a $29 300W step down connected to a TRS-80 Line Filter (basically a US 8-outlet power board) which is connected to my Model 4D, a hard drive, and whichever other US TRS-80s I happen to be working on with no sign of the capacity of the cheap Step Down being overloaded.


Model I: US power supplies are smaller and fit inside the Expansion Interface, Australian power supplies are larger and don't fit in the EI.

Model I: some machines (well, most) have an additional cable between the KB and EI making the keyboard and EI a matched pair.  The mod is called the DIN-cable mod.

Model III: virtually the same machine in both countries except US models are fitted with twin 120V power supplies.  RS232 was always an option on all Model IIIs.

Model 4: non-gate-array machines have B&W monitors, and keyboards by Maxi-Switch, optional RS232, as well as a 120V power supply.   By contrast Australian non-gate-array M4s had green phosphor monitors, ALPS keyboard, RS232 as standard, and a 240V power supply.

Model 4: Gate-array machines are virtually the same in either country, both came with a green phosphor monitor and a cheaper membrane action keyboard, and 120V power supply.  RS232 is standard because its built onto the motherboard now.

Tandy Model 4D: never sold in Australia but as the last and best TRS-80 it has a very high quality monitor, ALPS keyboard, double sided disk drives, and naturally a 120V power supply.

Model 4P: non-gate-array 4Ps have a B&W monitor, but are otherwise the same as Australian non-gate 4Ps, other than the 120V power supply.

Model 4P: gate-array 4Ps in both US and Australian models feature a green phosphor monitor but otherwise are the same machine except for the 120V power supply in the US versions.

Hard drives: TRS-80 hard drives have a Model 4 power supply installed and an A/C powered cooling fan; 120V for the US market and 240V for the Australian market.  Care must be taken to replace the fan with a 240V one if upgrading the power supply.

Color Computer 1 and 2: I never sell US Coco 1s and 2s because they are NTSC only and don't work properly on Australian PAL TVs.  However if someone really does want one I'm happy to do the import.

Color Computer 3: I may import these occasionally because they can be used with a monitor, but remember, like the CC1 and 2, the CC3 won't work properly on Australian PAL TVs.




TRS-80 Model 1 Voice Synthesizer demo

TRS-80 15meg disk system

Tandy 3 microcomputer (rare, not Model III, this is a Tandy 3)

(Added 1 April, 2012) TRS-80 Model 1 with both Level 1 and II installed in the keyboard unit

(Added 8 April 2012) How to change a TRS-80 Model III or 4 CRT

(Added 27 May 2012) Video of a hard drive booting up into 2 different DOSes

(Added 22 July 2012) Video of me looking at a LNW Expansion Interface for the Model 1

(Added 16 December 2012) Video of what to look for when buying a used TRS-80 Model III or 4

(Added 16 December 2012) Video of the checks and maintenance I go through when getting a Model III or 4 ready to sell.

(Added 30th March, 2013) Video of how to make a composite video cable for the Model I

(Added 24th October, 2014) Video of my entry for the TRS-80.ORG.UK Dr Who titles competition

(Added 24th October, 2014) Video of how to fix stuck brightness/contrast controls on Model III or 4

(Added 24th October, 2014) Video of how to fix video sync issues on the Model I

(Added 24th October, 2014) Video of how to fix serial port on Model 4 Gate Array motherboards

(Added 24th October, 2014) Video of unboxing a 1978 TRS-80 Model I Level I

(Added 24th October, 2014) Video of how to change the RAM badge on Model III, 4 and Coco

(Added 1st January, 2015) Video discussing Coco Floppy Disk Controllers

(Added 1st January, 2015) Video of how to update the FreHD PIC software version with a TRS-80

(Added 1st January, 2015) Video of how to add a Model III hi-res board to a Model 4

(Added 4th April, 2015): Video of how to repair a M2/12/16/16B/6000 keyboard

(Added 1st December, 2015): Video of how to set up and use a Quinnterface

(Added 25th March, 2016): Video of the new Clearly Superior FreHD/QI Combo Box

 (Added 1st October, 2016) Video of the NewBuff cable for the Expansion Interface

(Added 1st October, 2016) Video of the Serial Adapter Cable for the Model I

(Added 1st October, 2016) Video of the New_Perc Double Density Adapter for the Model I

(Added 15th November, 2016) Video of the RE-FD502 Coco FDC running on a Coco 3

(Added 1st October, 2016) Video of the RE-FD502 Coco FDC running ADOS 3 and DragonDos

(Added 31st July, 2017) Video Expansion Interface click test

NEW!! (Added 1st January, 2018): Copy your FreHD images onto your SD card to make extra working images of existing operating systems.




TRS8Bit Newsletter

TRS8Bit is a quarterly newsletter by Dusty from which I now write for.  Here are the articles I have written thus far:


September 2011: I talk about fixing Model I computers


December 2011: I talk about building the Model 4 "Super Micro", and talk about a solution to the white cable dilemma with Model IIIs and 4s.


March 2012: I talk about adding 4 internal disk drives into the super micro, how I restored the Yass Service Station Model I and a solution to the problem of yellowed keys.


June 2012: I talk about making 80-track bootable disks for LS-DOS, LDOS, and NEWDOS/80 to boot on the Super Micro, and I also talk about TRS-80 Model I/III/4/4P/4D CRT tubes.


September 2012: I talk about fitting hi-res graphics, RS232 and a simple speed up, and a hard drive to the Model 4 Super Micro.


December 2012: I talk about getting 5Mb and 15Mb hard drives ready for use again on TRS-80 Model III and 4.


March 2013: I talk about how to set up your hard drive partitions using RSHARDx, and I talk about fixing Model I RS232 boards.


June 2013: I talk about upgrading the hard drive with a newer, bigger MFM hard drive, and I discuss the Tandy TRS-80 Model 2000.


September 2013: I present an electronics project on building a Model 1 power supply, talk more about fixing Model I RS232 boards, and repair Model IIIs.


December 2013: I talk about adding a Hard drive or FreHD to a Model 1, repair and answer questions on the Model 4.


March 2014: I talk about building the FreHD Kit B, installing the FreHD into an external disk drive enclosure for the Model 1, write about the Dr Who Adventure game, and answer questions on the Model III.


JUNE 2014: I write about making a composite video cable for the Model I, how to install FreHD into a TRS-80 hard drive case, write new title graphics for the Dr Who Adventure, and answer questions on the Model I.


SEPT 2014: I write about setting up FreHD auto boot on the Model I, talk about the Model 4 Gate-Array motherboard, present a Screen Saver for the Model 4, and answer questions on the Model 4P.


DEC 2014: I write about setting up FreHD auto boot on the Model III and 4NGA, talk about the Model 4P Gate-Array motherboard, answer questions on the Model 4D, and install a Model III hi-res graphics board into a Model 4.


MAR 2015: I write about making a small neat box for the FreHD to reside in, restore a TRS-80 Model 16B microcomputer, and answer questions about the Tandy TRS-80 Model 2000 Personal Computer.


JUNE 2015: I write about using DSK/DCT to make real floppy disks and discuss Radio Shack Hi-res boards for the TRS-80 Model II, III and 4.


SEPT 2015: I write about the Grafyx Solution Hi-Res graphics boards for the Model III, 4 and 4P, and my new improved HRG boards available for purchase today.


DEC 2015: I write about SOLE double density booting on the Model I, as well as discuss various high resolution programs for the Model 4, and talk about hi-res articles and program in 80micro magazine in the 80s.


MARCH 2016: I write about Coco disk drive power transformers, Expansion Interfaces (part 1 of 2), the Mappa-1 CP/M research tool for the Model I, and discuss facets of the business.


JUNE 2016: I write about the Japanese Model Is, and talk about the new FreHD Clearly Superior series, I also update people on the biz.


SEPT 2016: I write about the long white-case Color Computers, how to repair your Model III/4/4P Serial port, and how to upgrade Model 4 Gate-Array and 4D computers with the Auto-boot FreHD Eprom.


DEC 2016: I write about Color Computer disk drives, SOLE for the Model I and the New_PERC doubler, and how to install a FreHD Auto Boot Eprom into the Model 4P portable computer.


MARCH 2017: I write about how to make a Printer Cable for the Model I/III/4/4D/4P/1000, discuss making Mappa-1 work with the RS Double Density Adapter, and talk about the Line Printer I.


JUNE 2017: I write about the PMC 50/40 Interface used for connecting a System-80 to a Radio Shack Expansion Interface, how to repair a Model III or 4 keyboard which has been damaged in transit, and talk about the Line Printer II.


SEPT 2017: I write about lowercase characters on the Model I and mention a potential problem with U3 when building FreHD Kit Bs.


DEC 2017: I write about my visit to Tandy Assembly, Part 2 of my article on lowercase on the Model I, Agriculture and the TRS-80 Model II, and talk about the Line Printer III/V/DMP-500. 


All can be downloaded from Dusty's site's downloads page.





Check these other fine web sites:






As a serious collector, I follow the Classic Computer Collector's Code of Conduct. The Code of Conduct is listed here for your reference:


The Classic Computer Collector's Code of Conduct


I do my best to find a home for any classic or unwanted computer.

I will return or destroy any personal or commercially sensitive data I find on a machine I acquire, and will keep it in the strictest confidence, should I find it necessary to view it.

I will aid users in the decommissioning of their old machines, should they require assistance.

I respect active software and publication copyrights.

I will, whenever possible, repair the computers in my collection and maintain them in working order, and will assist others in doing the same, to the best of my ability.


I actively encourage the repair, maintenance, and use of older computers, in preference to the irreversible alteration of machines and parts for non-computer applications.

I actively promote the exchange of computers, parts, and information among collectors, and will refrain from hoarding multiple examples of any item.

I actively promote ethical collecting.











Great Gallery of Esteemed TRS-80 Enthusiasts Systems:


Pictured below are systems of regular viewers of the web site and buyers of equipment from me.  Represented below are systems regularly in operation by their enthusiastic owners.


In no particular order:



Terry Stewart's Model 4 and Model 1 systems, Palmerston North, NZ.




John Benson's amazingly expanded Model 1 system, Lismore, NSW.




Bryce Kavanagh's single-drive Model III, Melbourne, VIC.




Dean Bear's 3.5" floppy-based Model 1 with custom power supply and Amber CRT Model 4, Downer, ACT.




Ian Robertson's much-modified Model 1 system, Tea Tree Gully, SA.




David Cooper's Tandy 1200HD and Model 1 systems, Seattle Washington, USA.




Dusty Miller's 16K cassette-based Model 1 system, Louth, UK.




Jim Eadie's Hard Disk-based Quad-floppy Model 4 "Super Micro", Montmorency, VIC.




John Benson's Tandy II triple drives plus hard disk, Lismore, NSW.




Kevin Warner's Model 4 and  III, Bunbury, WA.




Kevin Warner's Model 100, Bunbury, WA.




Ian Robertson's Model 4D 4-drive "Super" Microcomputer, Tea Tree Gully, SA.




Phil Avery's Model III and DMP-200 printer, Wanganui, NZ.




David Cooper's TRS-80 Model II, Seattle, Washington, USA.




David Cooper's Hard Disk based Model I, Seattle, Washington, USA.




Arvel Hathcock's Model 4, Grapevine, TX, USA.




Walter Shrauder's Model I, Wien, Austria.




Efisio Mancini's Coco 3 setup, Kensington Gardens, SA.




My 48K Model III Hard disk system with hi-res, green screen and IBM double sided floppy drives, and my 48K Model I system, Cairnlea, VIC.




Stephan Hodel's Model III, Switzerland.




Kurt Hamm's Model I, Columbia, SC, USA.




Bob Boyd's Hard disk-based Model 4P, Zelienople, PA, USA.




Ray Whitehurst's Model 4 Super Micro, Williamstown, VIC.




Bob Boyd's hard-disk based Model III, Zelienople, PA, USA.




Stephen Macmillan's Model 4 and Model I systems, Newcastle, NSW.




Don Gillies Genie I with Tandy Expansion Interface and monitor, Glen Iris, VIC.




Ivan Kennedy's Sydtrug 16K cassette M3 and 48K High-Resolution M3, North Ryde, NSW.




Ivan Kennedy's Sydtrug Model 4P, North Ryde, NSW.




Ivan Kennedy's Sydtrug 128K Model , North Ryde, NSW.




Malcolm Macleod's Model 4 with FreHD hard drive emulator connected, McLeod, VIC.




Ira Goldklang's hard disk based Model 4 Super Micro, Los Angeles, CA.




Andrew Quinn's Model III and 4, Ponsonby, Auckland, New Zealand.




Ivan Kennedy's 2nd Model 4 with FreHD, North Ryde, NSW.




Ivan Kennedy's 2nd Model 4P with FreHD, North Ryde, NSW.




Ray Whitehurst's Model III with FreHD, Williamstown, VIC.




Andrew Quinn's Model I system, Ponsonby, Auckland, New Zealand.




Frank Galphin's Model III, DeBary, FL, USA




David Cooper at his Model I in 1980, Seattle, WA, USA.




Rainer Fredrich's French-made Model 4, Dietzenbach, Germany.





Hans J. Rietveld's Model 4P, Den Haag, The Netherlands




Iain Hancock's Model 4 with FreHD, UK




Bas Gialopsos two Model 4 systems, UK.




Barrie Clark's Model 4, California, USA




Tim Krause's Model III, Sailor's Gully, VIC




Mike Holmes' Model 4 with amber CRT, Seattle, WA, USA




Bas Gialopsos Model III system, UK.




Tim Krause's Dick Smith System 80 early Black Label, Sailor's Gully, VIC.




Hans J. Rietveld's Model II, Den Haag, The Netherlands




Bill Bright's Model III, USA.




John M. Lee's Model I, Atlanta, GA, USA.




Hans J. Rietveld's Model I, Den Haag, The Netherlands




Brett Paulin's TRS-80 workshop, Glen Waverly, VIC.




Phil Avery's Model 4 with FreHD, Wanganui, NZ.




John Bradbury's Model 4, West Sussex, UK.




Peter Cetinski's Model III with FreHD, New York, USA.




Kevin Parker's Model 16B, Mortlake, VIC.




Don Gillies' System 80, Glen Iris, VIC.




John Benson's Tandy 3 system, Lismore, NSW.




Hans J. Rietveld's dual-drive Model 12 system, Den Haag, The Netherlands.




Jeff Brown's Model III, Melbourne, VIC.




Elden Foot's Color Computer 1 system, Gladestone, QLD.




Rick Ragnini's Model I with FreHD system, Darien, IL, USA.




Terry Stewart's Model I Level 1 system, Palmerston North, NZ.




Kevin Parker's Model 4 with FreHD, Mortlake, VIC.




James Gunn's Model III, Flagstaff Hill, South Australia.




Brad Nelson's TRS-80 8in business computer collection, Wisconsin, USA.




Brad Nelson's TRS-80 Model III system with hard drive and Line Printer V, Wisconsin, USA.




Peter Howard's Model I system, Morisset, NSW.




Bill Bright's Diskless Model III with FreHD, USA.




Pino Convertito's Model III with FreHD, Limena, Italy.




Hans J. Rietveld's Model III, Den Haag, The Netherlands




Pino Convertito's Hi-Resolution Model4P with FreHD, Limena, Italy.




John Benson's UK-spec Hi-Res Model I, Goonellabah, NSW.




John Benson's Hi-Res (PCG-80) System 80 running 'Catacombes', Goonellabah, NSW.




Bas Gialopsos Hi-Resolution Model I system, UK




Don Mankin's Hi-Res (80-Grafix) Model I, Lake Havasu City, Arizona.




John Benson's rare Tandy 2 microcomputer system , Goonellabah, NSW.




Patrick Jordan's Model I system, Pyrmont, NSW.




Pino Convertito's Model4 with FreHD, Limena, Italy.




Louie Compex's Model I and 4, USA.




Peter Howard's Model 4 system, Morisset, NSW.




John Moodie's 64K Coco 1, Morewell, VIC.




Jean-Marie Chauvet's Model , France.




Garry Howarth's Model 4P with FreHD, Hebersham NSW.




Régis Munoz Model I System, France



John Benson's Model 12, Lismore NSW.



My Model II system restored and working



Barry Armour's Model 4, Macedon, VIC.



Paul Curtis' Tandy Model 4D, Oregon, USA.