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2003-11-06
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Screen Save Program for the Hercules Graphics Card
There is in circulation on electronic bulletin boards, magazines and
users groups a program called variously, Mono Blank, Monitor Blank,
MONBLK2, SCRNSAVE, and probably a few other things by now too. The
program is designed to remove the display from the monochrome screen
after some period of inactivity. This is meant to protect the monitor
from having an image burned into the phospher if something is left on
the screen for a long time. The programs will work on IBM's monochrone
board, but are quite unsuitable for use with a monochrome graphics card.
This is because in graphics mode the 6845 CRT controller chip operates
with a different set of controlling parameters than it uses in a text
mode. If one of these programs goes into effect while the board is in
graphics mode it will remove the display, but will not replace proper
parameters. Quite severe monitor damage can result.
On this diskette is a file called HGC.COM. It is an elaboration of the
HGC.EXE file that has been shipped with the Hercules Graphics Card model
GB101. The program will blank the screen after there has not been any
activity at the keyboard for five minutes. It will ONLY run properly on
the Hercules Graphics Card. Do NOT use this program with a regular IBM
Monochrome Display/Printer Adapter Card, or any video adapter other than
the Hercules Graphics Card. If you are using any other version of this
program with a Hercules Graphics Card you should immediately get rid of
it. And tell anyone else that you know who may be using it in the same
situation to do so as well. This program was written by Hercules in
response to a number of their customers who were having unfortunate
experiences with other versions of this program.
To use the program simply type "HGC SAVE" while at the DOS level. If you
want to incorporate this command in a regular start-up configuration for
the Hercules Card, you can specify "HGC FULL SAVE" or "HGC HALF SAVE".
After the program takes effect, and blanks the screen, the display may be
restored by striking any key. (The shift key is recommended, because the
keystroke will be processed.)