Footnotes

(1)

A look at the TXTEXT source code file, `txtext.c', will show that it is easy to adapt this behavior to be simply the bounds of the written text, the XSIZE by YSIZE box (default), or even a "stretched" box, simply by changing a few lines and switches in the source. The remaining subfunctions will then use the values of this new box, instead

(2)

Internally, this is accomplished with a bitwise XOR with white, 0x0F, which turns 0x00 to 0x0F and 0x0F to 0x00. Note, however, that other colors will be "flipped" to different values altogether.

(3)

An anagram for "Usman's Borland Graphics Substitute".