Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!tut.cis.ohio-state.edu!ucbvax!ucsfcgl!cca.ucsf.edu!wet!tempest
From: tempest@wet.UUCP (Ken Lui)
Newsgroups: comp.sys.mac
Subject: Re: control characters in terminal emulation progs
Keywords: Red Ryder 10.3, VersaTerm 4.0
Message-ID: <224@wet.UUCP>
Date: 30 Jun 89 20:52:51 GMT
References: <14666@ut-emx.UUCP>
Reply-To: tempest@wet.UUCP (Ken Lui)
Organization: Wetware Diversions, San Francisco
Lines: 70

In article <14666@ut-emx.UUCP> jay@ut-emx.UUCP (Jay Boisseau) writes:
>When I try to type a ctrl-f (forward-one-character), or most any other
>ctrl character, everything is OK.  But when I try to type ctrl-@, or any
>of the ctrl characters involving a number key or shifted number key, I
>get the number entered into my text (whether I used shift or not).  I am
>using emacs, and have tried this with both RR 10.3 and VersaTerm 4.0.
>For example, to set the mark, the command is ctrl-@ (ctrl-shift-2).  This
>works fine on the GraphOn 225 I am currently using, but on my Mac is
>enters a '2' into the text, and nothing else.
>

It is a keyboard mapping problem.  I don't know of a way to get a
chr(0) out of the keyboard without using a specific program to do
it.  You can, however, get a Control-^ using the most recent
version of ResEdit.  This is the way I do it:

1.	Open a copy of the System file
2.	Open the KCHR resource.  You should see one labeled "US"
	for domestic units.  Open it; its ID should be 0.
3.	If you press the Control key, if you have an ADB
	keyboard, the keyboard template would change.  You'll
	see valid what the key combinations of Control-A, and
	so on would give you.
	The Table list would change from 0 (default), to 7.  I
	have an SE and am using System 6.0.2.
4.	To change a Control-6 to give you Control-^, select the
	2nd to the last square of the 2nd column from the left
	of the ASCII keys matrix.

	_________________________________________________
	|					Table 	|
	|	ASCII			key-	list	|
	|	keys			board		|
	|	matrix			matrix		|
	|						|
	|						|
	|	Keyboard facsimile			|
	|_______________________________________________|

	Drag the square to where the 6 is on the keyboard
	facsimile.
5.	Quit ResEdit and answer YES when the dialog box comes
	up.

Alternatively, you can create another Table that is used only
when Control-Shift is pressed.  What you need to do is to select
the table that's associated with the Control key by clicking on
it in the Table list.  Go to the KCHR menu and select Duplicate
Table (you won't have to re-enter all those control keys later
on).  Change Control-Shift-6 to reflect its ASCII counterpart.

That's it.

Unfortunately, if you assign ASCII "0" to Control-Shift-2 or
Control-2, pressing it on the Mac keyboard will get you NOTHING!
It really gives you a "NUL" key.  I haven't found any way to get
ASCII "0" to come out by using the KCHR resource.
Another gotcha with this "fix" is that I haven't tried it on a
Mac without a Control key.

I hope this helps a little bit.  If anybody out there in Netland
knows how to get an ASCII "0" from the keyboard by using the KCHR
resource, do tell.

Ken
-- 
_____________________________________________________________________________
     Kenneth K.F. Lui	   |  UUCP:	...{ucsfcca|claris}!wet!tempest
     tempest@wet.UUCP	   |  Internet:	cca.ucsf.edu!wet!tempest@cgl.ucsf.edu
			   |	-or- 	claris!wet!tempest@ames.arc.nasa.gov