A bitmap font.. I guess that one cheap way would be to have something up to 8 pixels wide per character and you could probably get away with about 5, 6 or 7 lines high.
You could draw the intro font in binary, line by line
eg;
//A
1,1,1,1,1,1,1,1
1,0,0,0,0,0,0,1
1,0,0,0,0,0,0,1
1,1,1,1,1,1,1,1
1,0,0,0,0,0,0,1
1,0,0,0,0,0,0,1
1,0,0,0,0,0,0,1
and convert each line of the font to a byte;
//A;
255,129,129,255,129,129,129
If you had a 5 line high font you could get away with 5 bytes per letter uncompressed which seems quite small, although it would look shit!
There are probably lots of better ways of doing this.
In some tiny stuff, I've noticed vector fonts being used, Gravity Theory uses one for example.
http://www.intro-inferno.com/production.php?id=1267That uses Opengl to load the font, but it's not a bitmap. Maybe the font could be loaded and then turned into a bitmap afterwards.