86-DOS 0.60

According to the MS-DOS 2.11 source code, 86-DOS 0.60 is an unreleased internal version of 86-DOS.

Change log
According to the DOSIO.ASM file from version 1.00, this version includes a new I/O system.

Also, from the MS-DOS 2.11 source code: ; 0.60 03/27/81 Ctrl-C exit changes, including register save on user stack