Q38312: Attributes in Hercules Graphics Mode

Article: Q38312
Product(s): See article
Version(s): 5.10
Operating System(s): MS-DOS
Keyword(s): ENDUSER | s_quickc | mspl13_c
Last Modified: 19-DEC-1988

Problem:

I'm using a Hercules graphics adapter in graphics mode and I would
like to do high-intensity "bold" graphics, but I can't seem to get it
to work correctly.

Response:

Using the Hercules graphics adapter in graphics mode, each pixel maps
to only 1 bit in memory. Because there is only 1 bit, that pixel can
only be on or off. In Hercules graphics mode, there is no facility for
attributes such as high-intensity, blinking, reverse, or underline.

In Hercules graphics mode, the only way to get blinking, reverse, and
underline is for your program to manipulate or turn on and off each
pixel. High-intensity will not be possible.

If you put the adapter into Text mode, you can use all of these
attributes freely.

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