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Looking for FreHD images, Auto Boot EPROM files, PIC updates and Hi-Res Auto Boot file?  Go to the DOWNLOADS page.


(Model I, III, 4, 4P, 4D)

(Updated 12th December, 2015)

Invented by Frédéric Vecoven in Belgium, the FreHD hard drive emulator enhances your TRS-80 with fast, unlimited, inexpensive storage on SD cards.  For insight into the design process of the fantastic FreHD, check out the inventors web site!


FreHD Kit A: $A20.00 or $USD15.00

FreHD Kit B: $A50.00 or $USD40.00

FreHD Kit C: $A250.00 or $USD179.00 - NEW LOWERED PRICE!

FreHD Kit C for Diskless Model III or 4: $A279.00 or $USD215.00

NEW!! CKD FreHD Kit: $A137.50 or $USD99.00

BoHx: $A30.00 or $USD25.00

Hard Drive Cable: $A45.00 or $USD40.00

Auto Boot Eprom (all systems): $A30.00 or $USD25.00

Model I hard drive adapter: $A50.00 or $USD40.00

Quinnterface: $A125.00 or $USD95.00



So far more than 80 have been made and sold to TRS-80 enthusiasts in Australia, New Zealand, USA, Germany, Netherlands and Canada.  It's the best new product for the TRS-80 in decades!  Orders are being taken by email and usually shipped within 5 days.  Email being what it is, sometimes it doesn't get through, so keep trying!



CKD FreHD Kit C for Electronics Enthusiasts

For soldering experts who like to save a few dollars - Ian.

(Added 1st January, 2016)

Completely Knocked Down (CKD) Kit C comes with all the parts of the normal fully assembled and tested Kit C, in unassembled form.  The PIC and GAL are pre-programmed, the CD and floppy disk are the same as is included with normal Kit C,  the only thing you need to supply is your own SD-card.


$USD99.00 ($A137.50) +shipping

What happens if you overestimate your soldering ability and can't get it running?  NO PROBLEM!  The same offer applies as previously (see bottom of the page "IAN! HELP!  I CAN'T GET MY FreHD KIT A or B TO RUN") I'll get your CKD kit running.  Fees apply, but you will have a running FreHD.




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 one which I now call the FreHD BoHx for $30+shipping which includes all the hardware needed to mount your FreHD.





(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.


GREAT NEWS for people who are capable of burning their own EPROMs, the upgrade is free.  Just go to the downloads page to get the EPROM BIN file and installation instructions.

If you need me to supply a burned EPROM for your system, no problems!  They are $25ea



(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) which typically have 16K of memory.  A reprogrammed EPROM replaces one inside your computer, allows your diskless TRS-80 to stay that way. The FreHD boots to a menu (see above) which allows you to choose which DOS (LDOS and Newdos/80 for Model III and all four DOSes for Model 4) and you never need a floppy drive!

The special Diskless Kit comprises of a FreHD, SD card with starter images, Special Auto-Boot EPROM, special power cable, Hard disk interface cable, and information CD.  Only $A279.00 NOTE: you will need to open your TRS-80 and install the new EPROM and plug in a cable.

This video shows the Diskless FreHD kit in action.

"Memory upgrades are recommended to make the most of this Kit - upgrading your Model III to 48K and Model 4 to 64K is a good idea - ask me how it's done (I sell the parts or can point out where to buy them in your part of the world) it's inexpensive and well worth it!"  - Ian.



(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 I, III, 4 Non-Gate-Array.  A reprogrammed EPROM replaces one inside your computer, and with firmware update to version 2.13, 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 disks!

This video shows the menu system in action on a TRS-80 Model 4 with replaced ROM C.

GREAT NEWS for people who are capable of burning their own EPROMs, the upgrade is free.  Just go to the downloads page and get the correct BIN file for your computer and burn it to an EPROM.

If you need me to supply a burned EPROM for your system, no problems!  They are $25ea, and will be sent with a CD with everything you need to get your TRS-80 auto-booting off FreHD.  I still need info on your system, but so far this upgrade can be done to the Model I, Model III and Model 4 Non-Gate Array, Model 4 Gate-Array, 4D and 4P.   Model 4 Gate Array, 4D and 4P need experience in soldering.



(Added 18th August, 2013)

The last of the problems which was stopping FreHD working on the Model I have now been solved!  FreHD now works on the Model I as well as it does on the III/4/4P/4D.  I supply Model I FreHDs with LDOS 5.3.1 on which has support for all popular Model I modifications like lowercase characters, double density and double sided drives.  To use FreHD on a Model I you need a M1 HD adapter board, and you can it on the Newstuff page.


When I started taking orders for the FreHD unit we had one operating system we know ran properly, LS-DOS 6.3.1 for the Model 4/4P/4D.  Shortly after we added LDOS 5.3.1 support for Model III users so you can store all your favourite old Model I/III games on your FreHD SD-card and load them instantly!


(Added 21st July, 2013)

Thanks to the help of Gary Howarth in Sydney, we can now offer an auto-booting image for TRS-80 Model 4P owners.  The 4P has always had the ability to boot directly from a hard drive, but for whatever reason Tandy decided to keep it a secret and have a consistent booting sequence for all Z80 TRS-80s using a boot floppy.  Patches to 2 files on your hard drive could make it auto-boot without a boot floppy disk, and it turns out these patches also work on FreHD.  So I can now offer a 4P hard drive image of 4 partitions, total capacity around 30Mb, which auto boots on your 4P.  Anyone who wants it can have it for free, just DOWNLOAD it.

Montezuma CP/M 2.2 READY!

(Updated 18th August, 2013)

CP/M is now approved for use on FreHD for Model 4 users.  As a nice bonus, on the 4P it will even auto-boot!  It works well and comes with a version of VHD Utilities called VHDUTL/COM.  The other utilities (IMPORT2, EXPORT2, and FUPDATE) may be modified to work properly in the future but for now the FreHD CP/M image is supplied without them, and feedback from CP/M users is they can get by without them; they are just happy to have a fast reliable hard disk system.


I started getting emails from CP/M enthusiasts and asking if FreHD was compatible with Montezuma CP/M 2.2 as an operating system, and J. Andrew Quinn tested it out and got it successfully running in four 7.5Mb partitions (Drives A: through D:) spread over 2 files on the SD card.  He then made some modifications to VHDUTL/CMD to become VHDUTL/COM, a specially patched version of VHDUTL/CMD for the CP/M world.



(Updated 10th November, 2013)

The last great Model I/III operating system, NEWDOS/80 did have hard drive support in its version 2.5 variant.  Enthusiasts Brett Paulin, Ray Whitehurst, J. Andrew Quinn have been working on getting NEWDOS/80 2.5 working on FreHD and I believe they have been getting encouraging results.  If you thought TRS-80 operators had too many options with PDRIVE settings, just wait till you add hard drive configurations into the mix!  Currently in the testing phase, I should have it ready to release as an alternative operating system to LDOS for those who prefer it.


I've made a few videos to show the FreHD working, to help people decide if the device suits their needs:

Video 1: Compares the FreHD with an actual TRS-80 MFM Hard drive.

Video 2: Shows what comes with Kit C, how to connect it and get booted up.

Video 3: Shows CP/M 2.2 running on FreHD.

Video 4: Shows 4P auto-boot LS-DOS 6.3.1 and CP/M 2.2

Video 5: Shows FreHD working on the TRS-80 Model I

Video 6: Shows FreHD auto-booting on a customer's Model 4

Video 7: Shows the auto boot menu system on a Model 4

Video 8: Shows FreHD Kit for Diskless Model III and 4

Video 9: Shows FreHD auto-booting on a Model I

NEW!! Video 10: Shows how to update the PIC firmware on FreHD




Have a read of our Knowledge Base and other information to decide whether you wish to buy a completely assembled FreHD or a Kit form which will need to be soldered together and parts supplied.


FreHD Utilities Suite

How to set up LS-DOS Boot Floppy Disk





It's easy to order Frédéric Vecoven's SD card Hard Drive Emulator (called the FreHD from now on).  Just send me an email outlining the items you wish to buy, what computer you wish to use it on, your choice of DOS - LDOS for Model I or III or LS-DOS or CP/M for Model 4/4D/4P), and I will send you my direct deposit details or if you're outside Australia I can accept PayPal payments. 


For those after more details and discussion on the FreHD drive check the following web sites: Fred Vecoven, Yahoo TRS-80 group, JAQ, and VCF.



"All prices exclude postage and I am happy to combine orders." - Ian

Kit A - is just the bare PCB and a CD of dropbox data and is best suited to
hard-core electronics enthusiasts who have the equipment to program GAL and PIC
chips. All parts need to be supplied by the builder, and a complete BOM list is
provided.  $A20


(Kit A comprises of PCB and information CD)

Kit B - is the PCB, and programmed GAL and PIC, SD card socket, battery holder, and a CD dropbox of data.  This kit suits people capable of soldering together a project kit of some complexity.  All parts apart from the PCB, GAL, PIC, SD socket and battery holder need to be supplied by the builder, and a complete BOM is provided. $A50


(Kit B comprises of the PCB, GAL, PIC, SD-socket, battery holder and information CD)

Kit C - is the fully assembled kit, tested, partitioned and loaded with DOS
ready to plug into your Model III, 4, 4D or 4P. Boot floppy disk provided.
Just connect it to a 5V power source, a hard drive cable, and boot the floppy. $A250 ($USD179.99)


(Kit C is completely assembled and tested, ready to plug in and use)


Hard drive cable - to connect the emulator or a regular TRS-80 hard drive to a Model III/4/4D/4P (NOTE: if you already have a TRS-80 hard drive you don't need this cable) $A45




Programmed GAL chip: $A20

Programmed PIC chip: $A25

Surface mount SD card socket: $A25

MAX232 chip: $A20

 NEW! 74LS245 chip: $A10

DS1307 chip: $A10

74HC595 chip: $A10

LP2950 regulator: $A5

BS170 transistor: $A5

Battery holder $A5




 "Sure, why not? - once you use the FreHD you'll probably never use your TRS-80 hard drive again." - Ian


If you want to save some money, trade-in your old working or non-working TRS-80 hard drive.  All I ask is that it's mostly complete.  If in doubt check with me.  I'll pay $50ea and the shipping for PRIMARY DRIVES, and $25ea and the shipping for SECONDARY DRIVES.

What will I do with them?  Those fixable will be restored and sold, and those unfixable will be gutted and FreHD units installed inside.




So you bought the kit, warmed up your soldering iron, read the BOM and put it all together the best you could, and it just doesn't want to work...  what now?  If you can't get it to run, I'm sure I can, so send it to me and I'll set it up on my test bench and make it work, returning you a fully working FreHD.  Replacement parts costs, a small fee for the time spent, and return shipping will be charged, but I WILL GET IT WORKING!


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