In a message dated 12/14/2006 3:16:31 P.M. Central Standard Time, [EMAIL PROTECTED] writes:
>000001FE BNZ 496(,R12) 4770 C1F0 Several other posts have explained what went wrong. I will add a little more: you have messed up your base register and/or local addressability so that the BNZ instruction, when executed, is a successful branch and the branch address happens to be in the middle of that same instruction. Or you may have branched into the middle of the BNZ some other way which is not obvious from the snippet of code you gave us. The CPU thinks you are trying to execute an instruction whose operation code is C1, which is a 6-byte long instruction since its op code is between C0 and FF. The PSW does not really point to the LA. It appears to point to the LA at first glance. Since the LA, if executed, would have resulted in an ILC of 4 and not 6, you should then conclude that the problem is not with the LA but somewhere else. Next you should suspect that you attempted to execute a 6-byte-long instruction just before the LA. Subtract 6 from the PSW's address and you can see the C1, which is a 6-byte instruction. The next step in debugging is to determine why you branched to the C1 as if it were the beginning of an executable instruction, which it is not. Bill Fairchild ---------------------------------------------------------------------- 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
