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HA! Thanks all of you!
Last,could you tell me the meaning of 0x40000000?Some forums said it is cache of Vram,use it can quickly load the data in Vram.Is it right?

THANX A LOTS!
I know 0x4400 is a Hex_nember,but how could the Hello World's maker get this number?
PSP's screen is 480*272,so I think the longest line have 480 pixels,why they difine LINESIZE 512? Why not 480?

I have read Hello The World's src.In pg.c I still have some problems that I could not understand,please help me! 1) 0x04000000 is PgVramAddr,then,what is 0x40000000? so I could not understand the code: char *pgGetVramAddr(unsigned long x,unsigned long y) { return pg_vramtop+...