Is where I thought this thread had diverged :) So, it's IBM that needs to write the millicode :)
Dave Gibney Information Technology Services Washington State University > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On > Behalf Of Tom Marchant > Sent: Wednesday, July 08, 2009 3:11 PM > To: IBM-MAIN@bama.ua.edu > Subject: Re: Computerworld: London Stock Exchange to Abandon Windows > > On Wed, 8 Jul 2009 13:52:24 -0700, Gibney, Dave wrote: > > >IANAL, nor am I an engineer :) But, I doubt millicode is frozen in > >hardware. I've always thought it to be machine instructions in "ROM" > or > >what they call "licensed internal code" > > > > Machine instructions in memory. IIRC it goes into HSA. There is no > documented interface for you to alter millicode or to provide your own > millicode routines. If you figured out a way, I'm sure IBM would find > a way > to stop you because it could cause integrity problems. > > In any case, if you wanted to write an x86 emulator, millicode would > not be > necessary. You could just as well write it in assembler to run as a > dedicated application. After all, millicode uses (approximately) the > same > instruction set. > > -- > Tom Marchant > > ---------------------------------------------------------------------- > 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 ---------------------------------------------------------------------- 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
