Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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    The range of valid pixel values and (x,y) coordinates depends on the cur-
    rent video mode.
 
    If bit 7 of AL is set, the new pixel value will be exclusive-OR'd (XOR)
    with the current contents of the pixel.
 
    Register BH is ignored for display modes that support only one page.
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