2009/4/23 David Andrews <d...@lists.duda.com>: > On Thu, 2009-04-23 at 14:57 -0400, Bob Rutledge wrote: >> It's not "[nonzero],0", it's "15,0". > > Hey, you're absolutely RIGHT. (I wonder if it's always been like this? > Am I mis-remembering stuff from 35 years ago?
Yup - it's always been like this. I think of it as "branch always, nowhere", vs the two other NOP formats of "branch never, somewhere", and "branch never, nowhere". That last one is what people usually think of as *the* NOP, but it's not the only one. > Anyone got a *really* old PrincOps?) http://bitsavers.org/pdf/ibm/370/princOps/GA22-7000-0_370_Principles_Of_Operation_Jun70.pdf is as old as you can get for S/370. Too old for your purposes, really, since it's just a little booklet that updates the S/360 POO. But even that is available at http://bitsavers.org/pdf/ibm/360/princOps/A22-6821-0_360PrincOps.pdf . Unfortunately these are not searchable PDFs. Tony H. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
