The 1500 bytes size is me being lazy to search for the right size, the grammar stops at the FF header anyway so knowing the size is not that useful. To answer

The 1500 bytes size is me being lazy to search for the right size, the grammar stops at the FF header anyway so knowing the size is not that useful. To answer the initial questions, I remember that the compression ended with like 40-20% fewer bytes for things without really big empty space. Later games on the SNES used lzss like compressions. Thou my owns implementation of the compression give better results (most of the time) for the original datas of the game that the tools used by Nintendo and it's pretty naive.