Yes, you really read it, Tifreak8x Pokémon Purple game now have scrolling map engine, it even scroll when you walk and it is very fast for pure TI-83+ BASIC, even on a regular 83+! Just see by yourself:
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If you don't believe it, just look by yourself:
http://omnimaga.unitedti.org/scrollwalkzip.zip 
The project keep progressing very nicely. Make sure you stay up to date in the
Pokémon Purple forum!