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From: "Alfred M. Szmidt" <ams@gnu.org>
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Subject: Re: Current mode command discovery
Date: Sat, 20 Feb 2021 18:53:43 -0500
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Archived-At: <http://permalink.gmane.org/gmane.emacs.devel/265364>

I (~20 YEARS AGO) HACKED EMACS ON A TEKTRONIX 4010 TO ALLOW ME TO DRAW
VECTOR GRAPHICS ON  THE DISPLAY FROM EMACS USING A  LOGO / TURTLE LIKE
LANGUAGE -- WHILE IT HAD A SHIFT KEY, IT ONLY WORKED FOR THE FIRST ROW
OF KEYS SINCE ALL LETTERS WHERE UPPER CASE.  IT DID NOT HAVE AN ESCAPE
KEY, YOU HAD TO TYPE CONTROL SHIFT K X TO GET M-X.

SO YOU MIGHT BE RIGHT IN THAT  MAYBE IT IS ACTUALLY M-X <LOWER CASE X>
THAT IS  UNTYPABLE ON THE  ANY TERMINAL ...   BUT LETS NOW  SHIFT THIS
DISCUSSION...