[pygy_]

You're distributing files copyrighted by Microsoft, namely msdos.sys, io.sys and possibly command.com (IIRC you could override it by setting the SHELL environment variable in config.sys).

They may be small, but they since pack the core functionality of MS-DOS, I don't know if a fair use defense would fly...

You should also distribute the source of the BIOS with the app (because Apple is the distributor, not you).

Otherwise, very cool project. Is your x86 emulator available somewhere? What will differentiate it from DOSBox?

[chj]

Yes, these files are the essential part of a boot disk. Did MS forbid people transfer boot disks when they were still selling DOS?

The emulator only runs on ARM cpu(at present works only for jailbroken iPad/iPhone). You can download it (free) at www.aemula.net/download.html

This is much less than DOSBox in terms of features, but when it runs, it runs fast.

[flatline3]

> Yes, these files are the essential part of a boot disk. Did MS forbid people transfer boot disks when they were still selling DOS?

Do you have a license that states you can ship those "essential" files? If not, then all you have is a copyright statement, which effectively forbids redistribution.