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C00002 00002	This file is DM.ME[UP,DOC] and lists some facts of interest to users
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This file is DM.ME[UP,DOC] and lists some facts of interest to users
of Datamedia terminals (DMs).

[Note: If you have trouble with typeout at any time, especially if tabs in
the typeout don't seem to work, type [BREAK] P (see below for how to type
this), which will clear and refresh your screen, including setting your
DM's tab stops.  If you have trouble with your line editor, type [ESC] R.]

DM terminals are considered full display terminals by the system, and
as such they have virtually all the capabilities possessed by DD and
III displays except 1) keyboard and screen mapping, 2) audio switch
control, and 3) vector displaying.  In particular, the line editor,
the wholine, and the full Stanford AI Lab character set with CONTROL
and META bits are available on DMs, although a few Stanford
characters must be quoted (see below) in order to be input.

To have a list of DM keyboard commands printed on the XGP, type HELP
DMKEY to the monitor and follow instructions; this currently can only
be done on a DD or III display.

Since the DM keyboard does not have keys for all of the Stanford
characters, certain characters must be typed in their ASCII CTRL
form; for example, partial-sign (∂) is ↑O and thus must be input as
CTRL-O.  Also, since the DM display does not have symbols for all the
Stanford characters, those characters that must be typed in as
CTRL-something will be displayed in a special form, namely as either
BLINKING-something or as BOLD-something.  Initially, these characters
will be displayed as BLINKING characters, but soon a hardware
modification to be installed in each DM display terminal will cause
the BLINKING characters to appear as BOLD.  Partial-sign (∂ or ↑O)
will thus be displayed as BLINKING-o now and BOLD-o later.  The XGP
printout made by HELP DMKEY lists the correspondences between
Stanford AI Lab characters and their ASCII CTRL representation.

Here is a summary of what you have to type to get certain effects:

	To get [ESC], type [NUL].  Most DD-type ESC commands work on DMs.
	To get [BREAK], type [NUL] and then "-" (minus sign).
	To get (CON)[char], type (EDIT)[char];
	       that is, hold down (EDIT) while typing [char].
	To get (META)[char], type (EDIT)[NUL] and then [char].
	To get (META)(CON)[char], type (EDIT)[NUL] and then (EDIT)[char].

	To undo [ESC] or [BREAK], type [DEL].
	To undo (META), type [NUL] and then [DEL].

	To get [CLEAR], type the bottom unlabelled key at keyboard left, or [MR].
	To get [FORM], type [↑L].
	To get [BS], type [DEL].
	To get [CALL] (that is, two ↑C's), type [CALL].
	To get deferred [CALL] (that is, one ↑C), type (EDIT)[CALL].

	To suspend typeout, type [HOLD]; to resume typeout, type [HOLD] again.

The three characters β≡∨ are hidden under the keys [CALL], [CLEAR],
and [HOLD], respectively.  To get one of the characters β≡∨, you must
quote it by preceding it with [NUL].  However, if you want (META)
with the character, then the quoting is automatic with the add-(META)
command (EDIT)[NUL].  Thus you cannot type (META)[CALL],
(META)[CLEAR], or (META)[HOLD] because you would get (META)β,
(META)≡, or (META)∨ instead.

When you first type a character on an "available" DM line, the system
will erase the DM screen and then set the DM's tab stops while typing
an initialization message at the top of the screen.  If you have a DM
terminal that does not have settable tab stops (all of the AI Lab's
DMs do have them), then you should type TTY NO TABS; in that mode
each tab to be output will be converted to an equivalent number of
spaces, which will of course usually take longer to output than just
a tab.

When you log out, your terminal will "go available" about five
seconds later.  A beep is output to tell you when this has
happened--your screen will not be erased at that time.  You should
not hang up the phone until you hear this beep; otherwise, someone
else may call in right then and be able to see what was displayed on
your screen.  When your terminal is "available", you cannot type
[ESC] or (META) until you have typed some other character to
initialize the terminal.  Typing [ESC] or (META) to an uninitialized
terminal will cause the echoing of a beep with no other result.

If you do not get the initialization message when you first type a
character after dialing in, then you should immediately do a [BREAK]P
(i.e., the three characters [NUL] - P) to force it.  This will
usually show you the display screen of the previous user who probably
hung up before the terminal "went available".  If you don't type
[BREAK]P in this case, there is no guarantee of consistent output as
your terminal may have its cursor at some place other than where the
system thinks it is.  If [BREAK]P doesn't get you the initialization
message but does erase and redraw the screen, then type the monitor
command TTY TABS (unless your DM terminal doesn't have settable tab
stops) followed by another [BREAK]P, which should get you the message
at the top of the screen.  If typeout screws up after correct
initialization, then either you are having phone line trouble or
there is some bug(s) in the DM display service--the former is the
best guess.  If you get perfectly repeatable typeout screwups, then
you may have found a display service bug and you should report to ME
exactly what you did to cause it.  You should also verify that it
happens on both phone lines.  If it only happens on one phone line,
then you should report the phone line trouble to TAG.

Notes:

If you try to position your page printer so that it falls off
the bottom of the display screen, then typeout may wrap around to the
top of the screen incorrectly.  This bug will be fixed later; such
page printer positioning should not be expected to work at present.

The user job part of the wholine is now only updated when it has changed.

The don't-allow-beeps command [BREAK]B is not valid from DMs as they
have no audio switch selection to preserve.  You can however turn
your beeper's volume up or down on the back of the keyboard.  Put
your terminal into local mode by disabling FULL DUPLEX and type
CTRL-G to make it beep to adjust the volume.  Be sure to restore
FULL DUPLEX when done.

The News Service hotline program HOT now works on DM terminals.

Dpy programs (UPGIOT UUO) now run on DMs--see UUO.UPD[S,DOC], page 15.

New improved DM line editor--if problem occurs, try [ESC] R or [BREAK] P.

While you are holding (even if HOLDING message does not appear), your line
editor will appear on the HOLDING message line (3rd line of screen).