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Annotation of 41BSD/cmd/ex/READ_ME, revision 1.1

1.1     ! root        1: 
        !             2: This is version 3.1 of the editor. It is too large to fit on a pdp-11
        !             3: unless you have overlay code. (Such code is expected to be available
        !             4: for v7 unix soon.)
        !             5: 
        !             6: Version 2.9 corresponds to version 3.1 without the enhancements in 3.1.
        !             7: There is no reason to use 2.9 unless you have a pdp-11 that does not have
        !             8: overlay software, since 3.1 contains all the bug fixes and some new features.
        !             9: 
        !            10: Special installation notes for this version.
        !            11: 1) If on a V6 system using -lretro, be sure to remove the line in
        !            12:    /usr/include/retrofit/sgtty.h that defines CBREAK. If you have
        !            13:    added a line defining TIOCSETN or TIOCGETC these should be removed.
        !            14: 2) The include file varargs.h should be installed, as the new printf needs it.
        !            15: 3) The include file local/uparm.h should be installed, as ex_tune.h needs it.
        !            16:    The contents of this include file can be modified if you wish to place
        !            17:    the editor in a nonstandard location.
        !            18: 4) Be sure not to use the -t1 compiler (which puts switches in I space and
        !            19:    hence makes larger I segments. This will causes the editor not to fit
        !            20:    in 64K on an 11.
        !            21: 5) Use the -t0 compiler which has a large enough symbol table. (V6 only)
        !            22: 6) Be sure to use the new termlib that goes with this version of the editor.
        !            23: 7) Be sure to use the new termcap.
        !            24: 8) Make sure the programs setenv and printenv are installed, and that setenv
        !            25:    is able to write /etc/htmp. (V6 only)
        !            26: 
        !            27: Conditional compilation flags:
        !            28:        -DTRACE         for debugging (wont then fit on an 11)
        !            29:        -DV6            for version 6, using raw (v7 uses cbreak)
        !            30:        -DVFORK         for UCB Vax/Unix with the vfork system call.
        !            31:        -DCHDIR         compile in undocumented old chdir (cd) command
        !            32:        -DLISP          compile in lisp hacks
        !            33:        -DUCVISUAL      compile in code to handle \ escapes for visual on
        !            34:                        upper case only terminals.  gross.
        !            35: 
        !            36: Ex means to avoid stdio like the plague. If any of stdio other than the
        !            37: ctype.h functions or str* get pulled in, it is a mistake.
        !            38: 
        !            39: Ex is very large, but should fit (barely) on an 11/70.  There are only
        !            40: a few bytes of room left in version 2.9 unless you take out some of
        !            41: CHDIR, LISP, or UCVISUAL. This assumes the new termlib (which knows
        !            42: about the tc= capability, 1024 byte entries, and @ cancellation of
        !            43: capabilities); and that -t1 is NOT used for compilation.

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