MiNT is Not TOS: A Multitasking Operating System Extension for the Atari ST

Copyright 1990,1991,1992 Eric R. Smith. All rights reserved. See the file
"copying" for conditions of redistribution.
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Features of MiNT that are incompatible with TOS (some might regard these
as bugs):

Processes may have only 32 open files each.

Not all information needed by Fsfirst is contained solely in the DTA
area, nor is the DTA set up the way TOS does. Programs that manipulate
the DTA directly will probably break.

Some low level disk utilities may get very confused if asked to operate on
a pseudo-drive like U:, or on a non-tos filesystem.

Doing a Dsetpath() call on a path that includes symbolic links may also
result in the current drive being changed, if any of the links point
to a different drive.

The BIOS I/O routines on devices 0, 1, and 2 may be redirected by
redirecting file handles -3, -2, and -1 respectively, i.e. they are
no longer guaranteed to access the same printer, rs232, and console
(although they do by default). Similarly, BIOS device 3 is controlled by
file handles -4 (input) and -5 (output) and so it might not always refer
to the MIDI port.

Filenames that are 4 characters long, with a ':' in the 4th position,
are assumed to be device names and are translated into references to U:\DEV
i.e. "con:" means "U:\DEV\CON". TOS doesn't always do this translation,
it seems, because I can recall creating files named "con:" in the current
directory (not that I *wanted* to, which is the whole point of MiNT's
feature).

All CTRL-ALT-function key combinations are reserved by MiNT.