-----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Richard Tsujimoto Sent: Tuesday, November 07, 2006 9:15 AM To: [email protected] Subject: Re: Assembler question
Is *discontinuity in assembler design* a nice way of saying, it's a bad design? I would think a length of 1 and 0 are different, and MVC should perform accordingly, e.g. if length=0, do nothing. <snip> Since the length for MVC is 8 bits, L=0 means to move 1 byte (aka Machine length). Should you take that number negative, you would get FF which is 256 bytes (since byte 0 must be counted). And you can't not generate the D2llBDDDBDDD, because you are allowed to come back and modify the storage used by the MVC. You may also EXecute this instruction... Just remember, this is a LOW LEVEL language, not a mid/hi level language. Later, Steve Thompson ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
