Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!samsung!caesar.cs.montana.edu!ogccse!orstcs!nyssa.CS.ORST.EDU!bleckmd
From: bleckmd@nyssa.CS.ORST.EDU (David Bleckmann)
Newsgroups: comp.terminals
Subject: TVI 925 protected mode emulation
Summary: How do you do it?
Message-ID: <13991@orstcs.CS.ORST.EDU>
Date: 27 Nov 89 21:20:38 GMT
Sender: usenet@orstcs.CS.ORST.EDU
Reply-To: bleckmd@nyssa.CS.ORST.EDU.UUCP (David Bleckmann)
Distribution: na
Organization: Oregon State University - CS - Corvallis Oregon
Lines: 37

I have the task of writing a termianal emulator for the TeleVidio 925
on an ibm pc which will interface with other software.  I have already
written an emulator which handels most TVI 925 commands, except for
its "Protected Mode" settings.  The host I now have to inerface with
uses this TVI 925 feature.

As far as I can tell from the TVI docs, "Protected Mode" is a mode
where each character on the screen is either protected or isn't, and
when "Protected Mode" is switced on, any protected character is not
overwritten.  If while the terminal is writing chars to the screen,
it comes to a protected char, it will skip over that and any following
protected chars trying to find of field that is not protected, and
then writes to it.  If "Protected Mode" is off, this searching/skipping
does not happen.

I would like to obtain an algorithm to do this that requires the least
ammount of memmory, as I am going to emulate up to 8 lines at once.

If someone has written such code and is willing to share it, or knows
of source code of a comm package that does the job, I would be
very happy to hear about it.  Fell free to mail me at the address below,
unless you feel it would be worthwhile to post.  I will summerize
responses if people call for it.

Thanks for all your time.

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