i have the book that other replier mentioned to you the:

"MCS6500

MICROCOMPUTER FAMILY

PROGRAMMING MANUAL

JANUARY 1976"

I have it in HTML format, its a very decent book.
Send me an e-mail to antenus@datafull.com and i will send you.

Im programming a 6502 emulator for a NES emulator im making. Im using "MOS Microcomputers Programmer Manual" as a reference and its quite decent, but i have the following problem/question regarded de CMP,CPX, CPY Instructions:

The manual says: "This instruction subtracts the contents of memory from ...