> I was wondering how, in several programs that seem to run in
 > text mode, they use high intensity colours for the background
 > as well as the foreground?
 > Does anyone know how to do this using C?

Well, it isn't in C, but take a look at Ralf Brown's interrupt list, INT
10h, along with the ega+ specific functions around sub-function 11h.
There's also a method of doing this on cga adaptors, but to be honest, I
wouldn't be bothered.


 > Another question, how can you change the text mode character
 > definitions, ie: where are they stored and in what format?

Again, INT 10H will help, again around the same region.


 > (I assume they are just stored sequentially, 8 bytes to each
 > character?)

No, not quite. The table/font size depends on the size of font on the
screen. You'll have 14x8 in 80x25, and 8x8 in 80x50 for example.

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