xtrs is a Radio Shack TRS-80 Model I/III/4/4P
emulator for Unix and the X Window System. It includes lower case,
the real time clock, hi-res graphics, serial port, parallel printer,
mouse, cassette, sound and music output (requires OSS), 5" and 8"
floppy disk drives in single and double density, and even hard disk
drives. The emulated floppy and hard disk file formats are compatible
with the popular MSDOS-based emulators by Jeff Vavasour, Matthew Reed,
and David Keil, and (if you choose a capable enough file format), all
features of the original TRS-80 floppy disk controller are
emulated. Under Linux, physical floppy disk drives are also
supported. Physical cassettes can be read and written too. The user
interface is a bit spartan, but it gets the job done.
out sdltrs by Mark Grebe,
and the updated version of
sdltrs maintainted by Jens Guenther.
It is a TRS-80 emulator for Linux, Mac OS X, and Windows based on
xtrs. All three versions of sdltrs have a text-based menu UI that
makes it easier to insert/remove emulated floppy disks and tapes and
to change other settings. The Mac version also has a nice native Mac
xtrs downloads and resources
work in progress is now hosted on GitHub. At this
writing, compared with the stable xtrs 4.9d release, the
GitHub version includes an optional GTK GUI (spartan but
usable), emulation of the Exatron Stringy Floppy,
code and documentation patches from several contributors, and a
few other fixes and cleanups.
- xtrs 4.9d (.tar.gz format)
(.zip format). Compared with
4.9c, version 4.9d adds a keybinding help window (press F11 to see
it), adds a feature so that NEWDOS/80 boots up knowing the date and
time, fixes a bug that prevented -delay and -autodelay from working
when compiled with newer versions of gcc that optimize better, and
also includes a few more obscure bug fixes and internal cleanups.
See the change log for details.
- ROM images for Model I/III/4 are available elsewhere on the Web.
I do not know the copyright status of these ROM images, and I have
no connection with the sites that offer them.
Some MS-DOS based TRS-80
emulators come with Model I and Model III/4 ROM image files.
These files will work in xtrs too.
- Alternatively, for Model III or Model 4 emulation, xtrs can use a
MODELA/III file as its ROM image. This is not identical to a real
Model III/4 ROM, but is close enough that almost 100% of TRS-80
programs will work with it. The LS-DOS
6.3.1H operating system disk that I have permission to
distribute includes a MODELA/III file. You can boot this operating
system using xtrs's Model 4P emulation and export the file for use
in Model III and 4 emulation, or for
convenience, click here to download
the MODELA/III file directly.
- For Model 4P emulation, you can use Pete Cervasio's free minimal
Model 4P boot ROM, now supplied with xtrs; however, the free ROM can
boot only Model 4 operating systems (not Model III), and only from
floppy disks. The original Model 4P boot ROM is copyrighted
software, but if you own a Model 4P, you can copy its boot ROM onto
a floppy for personal use using the instructions and tools in
this article, originally published
in the Misosys Quarterly 1.2.
- Technical documentation is available for the emulated floppy disk file formats used
by xtrs and other popular TRS-80 emulators.
- The original xtrs 1.0 was
written by David Gingold and Alec
Wolman; see their README file.
It emulates a Model I with cassette, 48KB of memory, and
an uppercase-only display.
If you are writing your own emulator, you are welcome to use my
code, in whole or as a guideline. The copyright on the original xtrs
code also permits such use. I would appreciate receiving a copy of
any improvements you make to the code, however, so that we can release
a better xtrs in the future when time permits.
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