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Jeff Vavasour's TRS-80 EMULATION Page
Jeff
Vavasour's TRS-80 EMULATION Page
Return to the
Vavasour family web site : Jeff's home page
Level
I BASIC in a browser
Run it now
| Software
| Info
TRS-80
Model I
Download now
| Info
TRS-80
Model III/4
Info
TRS-80
CoCo 2
Download now
| Info
TRS-80
CoCo 3
Download
now | Info
Timex/Sinclair
1000 in a browser
Run it now
| Software
| Info
General
History of Jeff's Emulators
About ROMs
Links
The M.I.C.E.
Project:
The World's Most Ill-Conceived
Emulator
Send email to Jeff Vavasour.
Except for the Online
T/S 1000 and BASIC in a browser, all
emulators shown here are for use with MS-DOS.
TRS-80
Level I BASIC in a browser (Java)
 Go
directly to the TRS-80 Level I BASIC Simulator now
Browse the Software
Library of ready-to-run programs for the
Simulator
Read more about the
Simulator on thte Help Page
Download an older MS-DOS
version of Level I BASIC (this version
does not include enhancements of the browser version)
If your browser supports Java, you'll be
able to write a BASIC program directly in your browser!
This is an adaptation of my earlier
TRS-80 Level I BASIC Simulator into Java. This Java version (in theory)
will run on any computer in any browser that supports
Java and JavaScript. As it is not an emulator, but rather
a recreation, I took the opportunity to add a couple additional features
including colour
support.I did this project for several reasons.
Computers these days have made programming inaccessible
to the average person. I wanted to reclaim the "old
ways" a bit, where a person could tinker, learn and
share what they've found. I chose a simple BASIC like
Level I BASIC because I wanted something easy for people
to learn.
Also, I've put up a Software
Library page. To start out, I've put three programs
there, but I invite everyone to try out this new BASIC
and submit their own
programs written in this browser-based Level I BASIC Simulator.
If you choose to submit something, your program will be
added to the library page (after it has been reviewed) so
that they can be shared with others. This Software Library has the
same philosophy as the 80's computer hobbiest magazines
like SoftSide, 80 Micro, etc.
I did this project as an experiment. I like to stay up
to date on current technology, and hadn't really had the
chance to explore Java or JavaScript in depth yet. (To be
honest, my initial impressions weren't good, but I
thought I'd do a real project before judging too
hastily.) Internally, this simulator was written pretty
oddly. I wrote QuickBASIC-based tools to auto-translate
my MS-DOS-based version
into C which was then brought over to Java as a starting
point. This is the initial release, so there may be bugs.
In fact, it may not work at all in some browsers or on
some computers. To that end, if you are having problems,
check out the reporting a
bug section of the Simulator's
help file.
TRS-80
Model I Emulator (freeware)
 Download
the complete TRS-80 Model I Emulator Version 3.02u
Supplement package only
(for users who've already installed an
older version 3.x)
Documentation on the
supplement package
Source code for TRS-80 Model I Emulator Version
3.02u
The TRS-80 Model I was the first
computer I attempted to emulate back in December of 1989.
The emulator evolved between then and 1997, ultimately
arriving at the state you find here. The Model I
Emulator was, for a time, a shareware product; however,
the registered version has been discontinued and the
unregistered Version
3.02u is all that remains. Out of respect to those
that have paid for the registered version, I will not be
releasing the final registered version (Version 3.01r) or
its source code for distribution.The emulator
simulates a 48K TRS-80 Model I with 4 disk drives,
printer, RS-232 board, and cassette drive.
UPDATE Release G includes the
following new features:
Optionally run the emulator on modern PCs at the
same speed as the original Model I regardless of
the speed of your computer.
Optionally disable the RS-232 emulation, which
caused occasional lockups on some computers.
Improved Windows XP support over Release F when
running at original TRS-80 speed.
Full details on the upgrade can be found here.
Previous users (including registered version):
If you are a user of a previous version of my Model I
Emulator, you need only download the supplement package and
unzip it to the directory containing your copy of the
Model I Emulator.
For the curious, if you have a working knowledge of
16-bit Intel assembly, the source code for the TRS-80 Model I Emulator
version 3.02u and the supplement
package is now available for download here.
Note: this is an unsupported product.
TRS-80
Model III/4 Emulator (commercial)
 TRS-80 Model III/4 Emulator
Manual in PDF
format (or view the text
version)
Download Virtual
Disk Utilities to test your PC's
compatibility
ADDENDUM to TRS-80
Model III/4 Emulator Manual, Version 2.4
Buy
Model III/4 Emulator at Computer
News 80's online store
View screen shots of the Model
III/4 Emulator
My TRS-80 Model III/4 Emulator is a
commercial product distributed by Computer
News 80. If you are interested in purchasing this
product, you should contact them. If you'd like more
information on the features and functionality of this
emulator, you can read the
documentation. Also, I strongly
recommend downloading the emulator's disk utilities prior to
purchasing the emulator. These utilities will allow a
properly-equipped PC to convert TRS-80 floppies into the
virtual disk format used by the emulator, and back. See
Section 2.1 within the manual
for details on how to use these utilities.
ABOUT THE VERSION 2.4 UPGRADE: If you
have already purchased this emulator prior to 2000, there
is an upgrade to Version
2.4 available. Visit Computer
News 80 for ordering details. If you ordered between
January and October 2000, the upgrade will be mailed to
you automatically from Computer
News 80. Orders shipped after October 2000 contain
the latest version and do not require an upgrade. Details
about the upgrade may be found in the version 2.4 addendum to the
manual.
BUG FIX: Recently, it has been
reported that some newer generation video cards show
improper colours when the emulator is put into CGA mode
and the monitor colour is set to green. If you are
experiencing this problem, download this patch program, save it
in the directory with the emulator, and type "GREEN
MODEL3.EXE" or "GREEN MODEL4.EXE" to patch
the appropriate emulator. (Thanks to Mark Fishman for
testing this solution.)
TRS-80
Colour Computer 2 Emulator (freeware)
 Download the CoCo 2
Emulator version 1.6
Download older version
1.3 release of RETRIEVE and DSKINI
Source code for CoCo 2 Emulator version 1.6 and
RETRIEVE/DSKINI version 1.3
My TRS-80 Colour Computer 2 Emulator
will run original CoCo as well as CoCo 2 software. As
with all the emulators here, the system requirements are
very modest by modern standards (16MHz 286 or better,
256K RAM, EGA or better graphics). Some modern
3D video cards have dropped support for EGA graphics, so
there may be compatibility problems.UPDATE:
Version 1.6 new features include:
Set the emulator to run at the
CoCo's original speed regardless of the speed of
your PC using the new "Original Speed"
option under the F6 Options Menu.
Improved Windows compatibility; no
more MS-DOS mode warnings.
CASOUT can now convert virtual
cassette files to .WAV files instead of just
outputting straight to your SoundBlaster. (Good
for non-standard audio cards and fast computers
which have problems with CASOUT.)
Horizontal sync interrupt now
supported.
Also available: Older
version 1.3 releases of RETRIEVE and DSKINI for those
having trouble with the ones that are in the version 1.6
package.
It's been noted on bit.listserv.coco
that RETRIEVE and DSKINI may not work with 360K 5
1/4" drives unless you set your PC's BIOS to
(mis-)identify the drive as a 720K 3 1/2" drive
instead. If you are having difficulty with both versions
of RETRIEVE/DSKINI, this is another option to try.
Consult your PC's motherboard manual for details on BIOS
configuration.
For the curious, if you have a working knowledge of
16-bit Intel assembly, the source code for the CoCo 2
Emulator version 1.6 as well as
the version 1.3 releases of
RETRIEVE and DSKINI can now be downloaded here.
Note: this is an unsupported product.
TRS-80
Colour Computer 3 Emulator (released to freeware)
 Download
version 1.6B of the CoCo 3 Emulator
Download MS-DOS file
enhancements and extended error messages for CoCo 3 BASIC
(see readme.txt within)
Download the older
version 1.3 release of RETRIEVE and DSKINI
Source code for CoCo 3 Emulator Version 1.6B
plus the beta Version 1.7
My TRS-80 CoCo 3 Emulator was in
distribution as shareware from 1994 to the end of 2001.
(From 1997 to 2001, the CoCo 3 Emulator was distributed
by Rick's Computer Enterprises.) The emulator was
designed to work with MS-DOS, and will still work with
most versions of Windows which support an MS-DOS Mode. It
does also work within Windows, but would run slowly. As
newer versions of Windows such as XP and 2000 no longer
support MS-DOS Mode, support for the emulator is becoming
more difficult. So, I've decided to discontinue the CoCo
3 Emulator as a shareware product, and instead make this Version 1.6B available
as freeware, as well as its source code. (The
emulator was written in 16-bit Intel assembly language.)
It's my hope that by making the source accessible, it
will help speed along development of the newer generation
of emulators which work with operating systems mine does
not (e.g. Windows XP, Mac OS X, etc.), thereby keeping to
CoCo alive.Generally speaking, this emulator was
fairly robust with CoCo BASIC and OS-9 as well as many
machine language programs for the CoCo 3. It did,
however, suffer great performance problems with games
that made aggressive use of the CoCo 3's custom GIME
graphics chip's more advanced features (including page
flipping and mid-screen mode changes). For OS-9 users, a
custom-designed boot ROM file was included so that one
could boot OS-9 without the need to transfer the CoCo's
ROM to your PC. It also included a virtual hard drive and
real time clock drivers for OS-9.
Optimal system requirements for the CoCo 3 Emulator
are VGA compatibility, 429K of low DOS memory free and
384K of free EMS. (Use the MS-DOS "MEM" command
to check your available memory.) A SoundBlaster on port
220H is also needed for SoundBlaster-based sound. With an
additional 1.5MB of EMS memory, you can run the emulator
as a 2MB CoCo 3. (To use the 2MB mode requires OS-9 and
special 3rd party drivers that were sold separately from
OS-9. If you are not familiar with the 2MB OS-9 setup, do
not enable the 2MB mode in the emulator. OS-9 will not
work on a 2MB CoCo without the appropriate drivers.) If
EMS is unavailable, the emulator will work as a 128K CoCo
3.
I'd like to thank those that registered the CoCo 3
Emulator with me over the years, and a particular thanks
to Rick Cooper of Rick's Computer Enterprises and his
friends at CFDM for providing the
push that made this product possible. Please note that
the original Version 1.60 will remain an exclusive to
registered users. Version
1.6B is a slightly different version. It has a
different -- but compatible -- 6809 core, as the original
cannot be distributed publicly for copyright reasons. As
such, Version 1.6B runs
somewhat slower, though it should still be plenty fast on
modern platforms.
IMPORTANT: There are some
compatibility issues between the CoCo 3 Emulator and
programs that make more ambitious use of the graphics
hardware, among other things. See the COCO3.DOC file
within Version 1.6B
under the sections "7.1 TROUBLESHOOTING" and
"9. COMMENTS" for more details.
Also available:
A patch to
the CoCo 3's BASIC ROM which, when used in
conjunction with this CoCo 3 Emulator, will give
more descriptive error messages (e.g.
"?SYNTAX ERROR" instead of
"?SN") and also an array of commands
which allow you to load/save files directly to
your MS-DOS directory from within the emulator. Warning:
this patch uses special features which
are only compatible with my CoCo 3 Emulator. The
ROM generated by the patch cannot be used with
other emulators.
Older version 1.3
releases of RETRIEVE and DSKINI for those
having trouble with the ones that are in the
version 1.60 package.
An incomplete Version 1.7 is included in the source code download.
This version was an experimental which provided
new functionality beyond the CoCo 3, such as
640x480 16-colour and 320x200 256-colour video
modes, support for the full PC keyboard, and 16MB
of RAM. Version 1.7 was a beta version, so it may
contain unknown bugs or problems.
The technical specifications for the .DSK virtual
disk format can be found off-site here.
Note that my CoCo 3
Emulator version 1.6B only recognised the
first of the optional header bytes, which allowed
the user to specify a sectors/track count of
other than 18.
To transfer files between your PC and OS-9
virtual disks, I recommend the third-party os9.exe
by Carey Bloodworth. Source code is included.
(Unfortunately, I don't have any contact
information for Carey. If you have questions
about this program, I suggest trying the
newsgroup bit.listserv.coco.)
It's been noted on bit.listserv.coco
that RETRIEVE and DSKINI may not work with 360K 5
1/4" drives unless you set your PC's BIOS to
(mis-)identify the drive as a 720K 3 1/2" drive
instead. If you are having difficulty with both versions
of RETRIEVE/DSKINI, this is another option to try.
Consult your PC's motherboard manual for details on BIOS
configuration.
Note: this is an unsupported product.
Timex/Sinclair
1000 Emulator (Java)
 Go directly to the
Timex/Sinclair 1000 Emulator now
Browse the Software
Library of ready-to-run programs for the T/S
1000 emulator
Download my older T/S
1000 Emulator for MS-DOS
If you're browser supports Java and
JavaScript, you'll be able to run a Timex/Sinclair 1000
in your browser window right
now. This is a follow-up to my previous Level I BASIC in a browser.OK, I
know the Timex/Sinclair 1000 is not a TRS-80,
but there is a connection. Having done a Z-80-based
emulator already with my TRS-80 Model I Emulator, and
owning a Timex/Sinclair 1000, I decided to see if I could
reverse engineer it as well. So, it uses the same core as
my TRS-80 Emulators, and, being my only home computer
emulator that isn't TRS-80, wasn't big enough to warrant
a page of its own.
This emulator emulates a Timex/Sinclair 1000 with
TS1016 16K RAM Expansion Pack.
With a little work, this browser-based
emulator can also use the same cassette images used
by other emulators. For details, see the import/export
section of saving your
program on the help page.
If you are running MS-DOS or Windows, you can also
download my older MS-DOS-based
T/S 1000 emulator if you prefer.
General
Emulator History
Follow this link to read a recount
of my introduction to the world of computers through the TRS-80,
the inspiration that lead me to start writing emulators, and the
impact it has had.
About
ROMs
In short, don't email me asking for ROMs. Forget it. I do not
endorse piracy in any form, including the concept of orphanware.
Please don't email me trying to persuade me that my point of view
needn't be so harsh; it hasn't changed in ten years of emulation
and uncountable debates.
The emulators were designed for people who already used the
computers, and want to continue to use them after maintaining the
physical hardware is no longer practical. The emulators come with
instructions on how to transfer the ROM image from a
legitimately-working original TRS-80. If your TRS-80 is not
working I cannot help you. In that situation, you won't be able
to read your software or data either.
The good news is that the Model III/4
Emulator running a Model 4 DOS such as LS-DOS or TRSDOS
version 6.x or the CoCo 3 Emulator running
OS-9 Level II do not need the original ROMs in order to function.
I have written a small stub boot ROM which will load these
particular operating systems, which otherwise only rely on the
computer's ROM to boot. So if you have PC-readable TRS-80 disks
but not a functional TRS-80, there is still hope.
The Timex/Sinclair 1000 Emulator,
mercifully, is an exception, as the ROM for that particular
system has been released into the public domain and so can be
distributed with the emulator.
The TRS-80 Level I Simulator is not
an emulator and so does not contain a ROM.
Links
These are some links which TRS-80
enthusiasts might like to check out:
CoCo Friends Disk Magazine
Web Archive - a complete online archive of all 71
issues of CoCo Friends Disk Magazine, a great source of
BASIC programs, tricks, art, etc. for the CoCo 3
hobbyist.
Computer
News 80 - a great source for TRS-80 Model III/4
hardware, repairs, upgrades, and software. They also sell
my TRS-80 Model III/4 Emulator and
provide a TRS-80 to PC disk transfer service.
Computer News 80
Blog/Forum - CN80 has also set up a blog and forum
online, mainly targeting support of TRS-80 Model 4 users.
Dragon
& Tandy CoCo Emulator Home Page - a CoCo Emulator
resource page
Ira Goldklang's TRS-80
Revived Pages - a one-stop source for the Z-80-based
TRS-80 line (Model I, III, 4). Other TRS-80s can be found
here.
The Tandy Color Computer
Resource Site.
Sock
Master's CoCo Home Page - John is an amazingly
talented CoCo programmer who regularly pushes the limits
of what the machine can do.
Scott Adams Grand
Adeventures - the official site of Scott Adams,
creator of the classic text-based adventures sold through
Adventure International in the TRS-80's heyday.
Includes downloadable and online versions of some of
those classic games.
All content ©2000 Jeff Vavasour. Updated March 19, 2008.
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