I'm trying to make a Item Duplication code that copies what's in Slot 1 to Slot 2. I properly should't try code type F but, I think, that's the codetype I should use to copy from slot 1 to slot 2

D3000000 121D89FE
F121D8800 ZZZZZZZ

That's what I have so far. Anyway, I noticed in the wiki it says "ZZZZ is how many bytes to write" I've learned what bits are. Not bytes. I've tried messing round with that bit for awhile and it hasn't only reason why maybe it doesn't work is I've only tested it on my flashcart I havn't had time to edit my XML file and use NitroHax so, anyway. Noob Question... What are bytes and besides the ZZZZZZZZZ is there anything else wrong with my code?

Thank you.
Fatboy