In Windows, it is possible to create a monochrome memory device context (DC) and then BitBlt it to the screen. In OS/2, if you try to do this, the drawing appears black.

In OS/2, do not draw to a monochrome memory DC. In addition, VGA and XGA drivers behave differently when you try to do this in OS/2.

In OS/2, you should instead draw to a color DC and then BitBlt into a monochrome DC.