Attached is an update to the original Prop Backpack TV overlay object, which allows users to define their own character glyphs (bitmaps). Unlike my initial attempt at this capacity, this version does not require mapping the entire font into RAM. Instead, 16-character blocks can be mapped, starting with $F0-$FF and working downwards. This is effected by placing the RAM blocks at the end of memory xxxx - $7FFF, so that they are contiguous with the ROM font, which begins at $8000. By changing the effective font address to the beginning of the RAM section and translating characters written into the overlay's window buffers by the amount of the offset, the font can bridge both RAM and ROM without exacting additional timing requirements on the realtime video overlay code.
Perfection is achieved not when there is nothing more to add, but when there is nothing left to take away.
-Antoine de Saint-Exupery
We had many discussions at the galley table and there had been many honest attempts to understand each other's thinking. There are several kinds of reception possible. There is the mind which lies in wait with traps for flaws, so set that it may miss, though not grasping it, a soundness. There is a second which is not reception at all, but blind flight because of laziness, or because some pattern is disturbed by the processes of the discussion. The best reception of all is that which is easy and relaxed, which says in effect, "Let me absorb this thing. Let me try to understand it without private barriers. When I have understood what you are saying, only then will I subject it to my own scrutiny and my own criticism." This is the finest of all critical approaches and the rarest.
The smallest and meanest of all is that which, being frightened or outraged by thinking outside or beyond its pattern, revenges itself senselessly; leaps on a misspelled word or a mispronunciation, drags tricky definition in by the scruff of the neck, and, ranging like a small unpleasant dog, rags and tears the structure to shreds.
-John Steinbeck, The Log from the Sea of Cortez