I did this inside idos on an iPad before Apple approved (then later revoked) the ability to drop binaries in the emulator. iDos (dosbox) shipped with a compiler

I did this inside idos on an iPad before Apple approved (then later revoked) the ability to drop binaries in the emulator. iDos (dosbox) shipped with a compiler and ability to map a serial port to a tcp socket. So I implemented an XMODEM receiver so I could load my retro warez inside the walled garden :) I spent more time writing the XMODEM receiver than I spent using software I sent over it. It’s never the destination, always the journey.