Briefly,

Has the NetBSD source files ever been built on a machine where `char' is
really `unsigned char'?  I have the feeling that it it hasn't been.  I
ask because I've stumbled across code of the form:

		if (tty->a_member_of_type_char == -1)

which, if char is unsigned, is a little pointless :-) (this was in the
kernel, exactly where is at home :-( ).

As an aside is the correct fix:

		(signed char)tty->a_member_of_type_char == -1
or
		tty->a_member_of_type_char == (char)(-1)

			Andrew