On Mon, 2013-12-30 at 14:55 -0500, Tony Harminc wrote: > Much earlier the 370/165 and /168 had a Load MicroProgram instruction > that loaded microcode from main storage. X'B9', iirc. Used by OLTEP > tests, I think.
I have a hazy memory of the /145 having a similar instruction (possibly a variant of DIAGNOSE). It required the CE key to be present. I turned on lots of red lights on that /145 console trying to adjust the barricade register that separated microcode store from s370 store. That machine was a private playground for a few of us on the weekends, a half-million-dollar Adventure game. I kinda miss those days. -- David Andrews A. Duda & Sons, Inc. david.andr...@duda.com ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
