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But i want to understand, why not read it immediately? Why CPU needs that delay? And why then reading of $3F00-$3FFF should not be delayed?? Most of us don't know about the hardware details, so I'm not sure you'll get a definitive answer to this. What we DO know though is that the pattern and name ...

>I'm not sure what the internal buffer is this is just a 1 byte value of previous read operation in address range 0-$3EFF, as i understand! I just made correct delayed read, not just "-1". But i want to understand, why not read it immediately? Why CPU needs that delay? And why then reading...

Are you making sure that data read back from CHR ROM is delayed by one read? For example, point the VRAM address at $1F00, where $1F00 contains "HELLO WORLD",0, and reading $2007 will read back a byte of garbage before "HELLO". OMG! O____O Just fixed! Thanx!!! Look what i did: u...

Thanks for reply! Yep, SMB is reading something from CHR-ROM, but reading is already implemented! : \ Maybe that can help: i tried to run CPU/PPU test ROMs on my EMU, but i can't see any sprites rendered! (only black screen). I tried so many tricks, so i don't have ideas now on what is wrong with em...

Hi all! Sorry, if my English isn't good : ) I'm newbie in emulation! Seven days ago i started to write my first emulator (of course NES ^__^). I had no imagination about how to write it or how it should works : ) Anyway, after 7 days (now) i can run few simple games, like SuperMarioBrothers, Exciteb...