PdAndro

Versatile mini traditional computer with command line interface. Manage files from the command line. Write new software similar to the days of MSDOS.

Same as Bochs can do, but using ARM instructions instead of x86.
Also similar to Termux, but a much simpler system, like MSDOS was itself.

The app is completely free (no cost, no ads - it was a labor of love), and all source code is available, and it is all public domain.

There is some necessary Kotlin code, and some necessary assembler code, but most of the work is done in C90 (ISO C) which is included in the PDOS project at http://pdos.org (see the "generic" directory of the source tree).