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From: daver@hpsgpa.UUCP
Newsgroups: comp.sys.hp
Subject: Re: Need screen blanker for HP9000/300
Message-ID: <2790007@hpsgpa.HP.COM>
Date: Thu, 29-Oct-87 01:00:36 EST
Article-I.D.: hpsgpa.2790007
Posted: Thu Oct 29 01:00:36 1987
Date-Received: Sat, 31-Oct-87 17:24:19 EST
References: <1145@puff.wisc.edu>
Organization: HP Singapore IC Design Ctr
Lines: 35

>Here at the UW-Madison Comp Sci dept we are using several HP9000/300's
>running HP-UX 5.3 with HPwindows. They have 98544a video boards driving 17"
>monochrome monitors, which are already starting to show signs of burn-in. Has
>anyone come across a screen-blanking utility? If so, posting or e-mail would be
>appreciated. advTHANKSance

The 300 responds to standard HP terminal escape sequences, including the ones
which set the display color map.  My .profile contains a trap 0 which sets the
colors I use to black background and black characters, effectively blanking the
screen when I logoff.  The sequence \033&v0a0b0c0x0y0z0I sets color 0 to black
on black.

The form of the escape sequence is ESC&v to select the proper display
enhancement subset followed by various parameters expressed as 
<value><parameter letter> with the final parameter letter being uppercase.
The parameter letters are:

       a   foreground red           x   background red
       b   foreground green         y   background green
       c   foreground blue          z   background blue

each of which take 0 or 1 as values, specifying whether the corresponding color
gun is on or off, and I, which specifies which of the color map colors on the
screen is being affected.
    
A problem with the approach is that I have to logon the system blind, though
you can reset all the colors in the color map to their default values by
hitting CTRL-SHIFT-RESET.  My .profile automatically resets the color map to my
preferred colors when I logon (I use blue on cyan, with black on cyan for shell
command inputs selected as color 6 by my PS1):

                          echo '\033&v0m0a0b1c0x1y1zI'
                          echo '\033&v0m0a0b0c0x1y1z6I'
                          PS1="&v6S$D"  
Good luck.