[email protected] (Thompson, Steve) writes: > <SNIP> > > 3033 and 3081 in 370 mode were 24bit (16mbyte) addressing (real & > virtual). > > <SNIPPAGE> > > Didn't the 30xx machines have 26 bit addressing (the "3033 mode") when > operating in S/370 mode? Starting with the 3033MP?
re: http://www.garlic.com/~lynn/2009g.html#71 308x Processors - was "Mainframe articles" ... the 3033 had special page table entry definition for 14-bit real page number (16384 4096byte real pages or 64mbytes). the internal 3033 hardware could address more than 16mbites ... but instructions (both real and virtual) were limited to 24bits. 3033 hardware hack for >16mbytes ... supported >16mbyte "effective" addresses from (31bit) IDALs or as output of virtual address translation (using 14bit page number in the page number entry). however instruction addressing (whether running in virtual addressing mode or running w/o virtual address translation turned on) was still limited to 24bit addressing. the "32mbyte" option was independent of 3033mp. -- 40+yrs virtualization experience (since Jan68), online at home since Mar1970 ---------------------------------------------------------------------- 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
