Path: utzoo!attcan!uunet!portal!cup.portal.com!Ordania-DM
From: Ordania-DM@cup.portal.com
Newsgroups: comp.sys.atari.8bit
Subject: Re: 6502 timing question
Message-ID: <8950@cup.portal.com>
Date: 10 Sep 88 22:00:18 GMT
References: <8809091641.AA15253@ucbvax.Berkeley.EDU>
Organization: The Portal System (TM)
Lines: 27
XPortal-User-Id: 1.1001.5273


  Here are the timing specs for LDA and STA:
  opcode  mode  cycles
   LDA    imm    2
    "     abs    4
    "     z-page 3
    "    (ind,x) 6
    "    (ind),y 5*
    "    zpage,x 4
    "     abs,x  4*
    "     abs,y  4*
   STA    abs    4
    "     z-page 3
    "    (ind,x) 6
    "    (ind),y 5*
    "    zpage,x 4
    "     abs,x  4*
    "     abs,y  4*
  
  * Add 1 cycle if page boundary is crossed.
  
   As you can see, they take the same amount of time regardless of the opcode,
 the timing is dependent on the addressing mode, and where the data to be 
addressed is located (within a page as opposed to across several pages).
 
 
  I don't know if this will help you much, but it is what you asked for.