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scrutil.doc
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1991-08-22
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SCRUTIL 9.1 - (c) Kai Uwe Rommel - Aug 21 1991
This is the first public release of SCRUTIL & SCRBLANK, the successor
of the EGAUTIL screen saver (from which it inherited the version
number). Beginning with this release, it now supports also 8514/A
graphics cards. Because of this I have renamed it from EGAUTIL to
SCRUTIL.
This is a screen saver on which I am working already for a long time.
It runs on EGA or VGA under DOS and has some special features. It
monitors not only the keyboard but also a Microsoft-compatible mouse,
if installed (compatible on driver level, Logimouse was tested with an
earlier version). With the /8 option, it blanks also 8514/A graphics
cards. This was tested with a WD (Paradise) 8514/A+ but should work
with IBM and ATI 8514/A cards as well. It does not require any kind
of resident adapter interface software to be loaded (such as IBM's
HDI or WD's WDAI, they are not required). Also, it can blank a
secondary monochrome Hercules display, if installed. See the help page
for details.
I added a DLL, SCRBLANK.EXE, for use under Windows. This DLL establishes a
system hook and notifies the screen saver of Keyboard and Mouse events.
They communicate via the multiplex interrrupt (INT 2F). This DLL works
under Windows 3.0 or newer only (in all three modes, real, standard and
386 enhanced). The INT 2F seems to be clean to be called in protected
mode, even in 286 standard mode (the INT 2F is the preferred method for
communication with TSR's under DOS anyway). Without this DLL loaded, the
screen will never be blanked in standard or enhanced mode.
I have tested it under Windows 3.0 with heavy load and it always worked
well. But if you have problems with it, please reportthem to me.
The screen is blanked by completely switching off the display(s). That means
if you would like some pictur/graphics/animation, then this one is not
for you ..., but this has the advantage, that all the Windows do not have
to be repainted, when the screen is switched back on.
I wanted the screen (and the monochrome debugging display) to be
*completely* blanked. I find these animated screen savers boring after a
while - so I wrote one that is boring from the beginning :-)
When running Windows with SCRBLANK.EXE, if the mouse is moved into the upper
right corner of the display, the screen is blanked instantly. If it is
moved into the lower right corner, the screen will never be blanked.
When running plain DOS without Windows, the screen can be blanked manually
by pressing Sys-Request (Alt-PrintScreen) and then the key S (short clicks
are heard when pressing these two keys).
Install the screen saver main program SCRUTIL.COM in AUTOEXEC.BAT with
SCRUTIL /I /D:delay [/M] [/8] [/2]
The delay is in minutes, /M means a mouse is installed (probably you all have
one), /8 means a 8514/A is installed, /2 means a secondary monochrome display
is installed.
Put the SCRBLANK.EXE into WIN.INI into the "Load=" line
Load=SCRBLANK ...
(You perhaps have more programs listed in this line).
Kai Uwe Rommel
Munich
rommel@informatik.tu-muenchen.de