David.Speake wrote: > This stimulates. Why should they not be able to run > UNIX/LINEX/AS400/Alpha-VMS or even Windows on Z chips without Z/OS or VM. I > have no idea what the instruction set burned into the metal is like nor how > I/O is really done at the hardware level. The ONLY metal instruction I know > of is SIE and I saw that one here less than a month ago. Does only the > milli/micro/nano code have to change for it to pretend to be anything > desired? Does this level resemble S/360 decedents POP instructions at all? I > saw some S/370 micro code listings about 30 years ago, but... For all I know > the Z chips have the same "metal" instruction set as the Pentium X/Y/Z > whatever. Pointers desired and apreciated.
recent posting on macrocode that amdahl implemented original hypervisor ... tge eventual response was pr/sm on 3090. http://www.garlic.com/~lynn/2006b.html#38 blast from the past ... macrocode the low-end and mid-range 370s tended to be "vertical" microcode ... i.e. instructions look a lot like machine code (for a long time, the sort of rule of thumb was that there was an avg. of 10 "microcode" instructions for every 370 instruction). the high-end 370s tended to be "horizontal" microcode (something more akin to itanium rather than pentium). at one point there was a large project to converge the large number of (different) internal microprocessors to 801/risc. and the follow-on to the 4341 (4381) was going to use a 801/risc processor. that was eventually killed when it was shown that it was becoming possible to implement a large fraction of 370 instructions directly in silicon. misc. 801, risc, romp, rios, power, power/pc, fort knox and somerset postings http://www.garlic.com/~lynn/subtopic.html#801 for some topic drift a somewhat related post in comp.arch http://www.garlic.com/~lynn/2006c.html#3 Architectural support for programming languages lots of past postings about 360 and 370 microcode http://www.garlic.com/~lynn/subtopic.html#mcode a recent posting touching on horizontal microcode processor in the 3830 disk controller being replaced with jib-prime vertical microcode processor in the 3880 http://www.garlic.com/~lynn/2006c.html#6 IBM 610 workstation computer ---------------------------------------------------------------------- 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
