diffs for KA9Q (and other things)

[Charles Hedrick]

Several people have asked recently about bringing up the KA9Q TCP/IP
implementation under Microport Unix.  I have diffs for doing it under
SV/AT.  I posted these before, so I think it would be better for me to
mail them to people who are interested.  (The file is 28Kbytes.)  In
my opinion, SLIP is just a toy at 2400 baud or less.  (It still might
be useful to help get experience with TCP/IP.)  At 9600 baud it seems
like it might be a fairly useful thing.  In any case, note that in
order to use SLIP, you have to find a system that is on an IP network
and that is prepared to allow you to connect to it with SLIP.

Just for the record, here are the things for SV/AT that I keep around.
These have all been posted to this group, but as far as I know there
is no archive site for this group.  (I used to cc Microport on these
things, hoping they'd put a copy of their bbs, but nothing seemed to
come of that.)  In general I send my changes back to the program
author, so it's quite possible that in many cases these changes are
not needed with the latest versions of the software.  (This is not
true with ksh, at least.  Dave Korn considers the System V sxt code
impossibly buggy, and is now supports job control only under Berkeley
Unix or System V with Berkeley code merged in.  Thus he has not
accepted my diffs, and may even have removed the code that the diffs
fix.  That would be a shame, since job control really does work well
on SV/AT.)

ka9q - diffs to make it work under SV/AT, including workaround for
	a compiler bug and fixes for various problems with the
	way ka9q uses System V I/O .

kermit - diff to make long packet mode work.  This increases tranfer
	efficiency significantly.  (This has been reported to
	Columbia and may be in the current release.)

ksh - diffs to allow ksh to use the sxt device to emulate Berkeley
	job control.  Note that ksh itself is an ATT product, although
	relatively inexpensive.  So you have to get that source from
	the ATT toolchest, or convince Microport to release my version
	of ksh.  (Job control is the ability to suspend a job that
	you are currently talking to, and come back to it later,
	and to move jobs between foreground and background.  So you
	can start a job, then decide you want it to proceed as if
	you have run it with "&", then if it needs terminal I/O
	bring it back into foreground status to interact with it.
	It's probably the most important feature of Berkeley csh that 
	is missing from sh (and most System V versions of csh --
	System V people generally don't like csh because the copy
	they've got has all the interesting features left out.)

malloc - a large-model malloc that (1) works [unlike Microport's], and
	(2) takes special care to minimize the number of times it
	does brk or sbrk calls.  This speeds up programs that use
	malloc by a very dramatic amount.  E.g. loading files into
	microemacs is much faster when it's built with this version.
	(The reason is the sbrk typically causes your program to
	be swapped.  This makes it a very expensive system call.
	This optimization may be important only on machines with
	less than 2M of memory.)

mg (micro Gnu Emacs) - changes to make it do file name and command
	completion and ?

sc (spreadsheet calculator) - changes to make it work under SV/AT

xlisp - minor changes to make it work with SV/AT