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000254_news@columbia.edu _Wed Nov 3 16:59:26 1999.msg
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From: jaltman@watsun.cc.columbia.edu (Jeffrey Altman)
Subject: Re: Colors with vt220
Date: 3 Nov 1999 21:56:37 GMT
Organization: Columbia University
Message-ID: <7vqb2l$dsa$1@newsmaster.cc.columbia.edu>
To: kermit.misc@columbia.edu
In article <rX1U3.61$L4.4815@news3.voicenet.com>,
Christopher Mosley <cmosley@voicenet.com> wrote:
: I don't think vt100, vt220 are officially, explicitly color
: terminals but there is color support in mskermit. Some unix text programs
: that use color, not all but a few, do not work very well with vt220 emulation
: (set term type vt220) but _do_ work with "set term type ansibbs" in mskermit.
: I believe these same programs work well in various xterms in xwindows on
: linux, I would have to check to be absolutely sure. I used scripts to
: work around this in mskermit, using apc to change term type then running
: program, then using apc to return to a vt terminal. Wondering generally
: why this is?
The VT220 does not have any support for color escape sequences.
The so called ANSI-BBS terminals implement a subset of the color
sequences defined in the standard document ANSI X3.64. These same
sequences are implemented in many Unix console drivers: SCO ANSI,
AT386, Linux, ...
But the fact that a terminal does or does not support the color
sequences has little to do with whether or not two given terminal
types are compatible. The VT terminals use a different line wrap
rules than most of the Unix consoles excluding Linux. The SCO ANSI
and AT386 terminal drivers both support colors but have different
rules for what happens when an attribute reset command is received.
One resets the colors as if they are attributes (bold, underline, blink,
...) and the other doesn't.
The reality is that each and every terminal and console driver is
different and you need to use a emulator that understands each of
the different variations. That is why Kermit 95 has so many terminal
definitions.
Jeffrey Altman * Sr.Software Designer * Kermit-95 for Win32 and OS/2
The Kermit Project * Columbia University
612 West 115th St #716 * New York, NY * 10025
http://www.kermit-project.org/k95.html * kermit-support@kermit-project.org