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Disk-based Model III Emulator Help (beta!)
Emulator by Peter Phillips.

"Autorun" or "Program on Disk" emulation
If an emulation does not work as the default type of emulation, try clicking on "Autorun" or "Program on Disk" as the emulation. This boots a virtual TRS-DOS 1.3 system disk with the listed programs on the disk and autoruns the program.

"Debug" or "2-Disk Debug"
Because sometimes all of the programs don't fit onto a system disk, there is also "Debug" or "2-Disk Debug," which boots a 2-disk system with a TRS DOS 1.3 system disk in Drive 0 and all of the programs on a disk in Drive 1. For the two-disk emulation, nothing is auto-run. You have to manually run the program by typing it into the DOS prompt.

The system disk has my custom splash screen and DOS prompt, but is otherwise standard TRS DOS 1.3. It also has some extra utilities (try "CAT 1A" to get an alphabetical listing of the files on the disk in Drive 1). There are also options to boot from NewDos-80, LDOS, and DosPlus, though be warned those DOS's are not compatible with the disk image created for Drive 1 if that disk image is generated from a collection of files and not directly from a .DSK or .DMK file.

Incompatible .DSK/.DMK files
Many of the .DSK or .DMK images are not compatible with TRS-DOS 1.3. These disk files may not work with the emulator, even in debug mode. You might try them in 2-disk debug mode and then booting from a different DOS.

If none of the emulation types work, remember that the disk-based (v1.5) emulator is (1) technically still in beta testing, and (2) emulates a Model III-based disk system. So several disk images and/or programs may not work with it. Note also that the emulator starts with audio muted on iOS devices because there are issues with audio on iOS devices. Peter is working on this when he can.

Also, be patient. Some of the BASIC programs take a while to load from the virtual disk, particularly on a slow platform.

See Peter Phillip's Emulator Page for more help.