xtrs (TRS-80 Model I/III/4/4P Emulator for Unix) 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, 5" and 8" floppy disk drives in single and double density, and even hard disk drives. A simple xtrs.desktop file is included that will start xtrs with the default options. Read the included 'xtrs' man page after installation for more information and command-line options.