Thank you very much for putting up the source code for your demonstration. The style is good and gives me ideas about where it could be taken.
One thing I would like to ask about is the size of the sprite, is that the actual size of what it was on the SNES or a reduced resolution made to make some things easier? My poor eyesight cannot even make Chrono out on the screen.
As far as your C coding style, I’d like to give a few tips. First this depends wholly on how you approached the program, if you decided just to do it quick and dirty because it’s a simple demo, then my tips may not apply too much.
The first thing I noticed is that you have a very large main() function, you may want to break up the operations into discreet functions that can be re-used as needed. This helps from a readability standpoint as well as or identifying and fixing problems. It is difficult to fix a problem if you have identical code in multiple places.
Secondly, you may wish to consider using fewer multiplies if you can avoid them. Replace them with bit shifts (if multiplying or dividing by a power of two) or by adding to an accumulator with each loop iteration. The Virtual Boy is a low power device. Multiply instructions are extremely expensive when compared with addition, so if you can get away with an add instead, do it.
