shmuel+...@patriot.net (Shmuel Metz , Seymour J.) writes: > The S/370 supported both 2 KiB and 4 KiB pages; the 360/67 only > supported 4 KiB. As I recall, DOS/VS and OS/VS1 used 2 KiB, while > OS/VS2 used 4 KiB. I don't recall what page sizes Virtual Machine > Facility/370 supported.
360/67 support 4kbyte pages and 1mbyte segments ... but it also supported 24bit and 32bit virtual addressing modes (aka 16mbyte and 4gbyte virtual address spaces). 370 support 2kbyte and 4kbyte pages and 64kbyte and 1mbyte segments ... but only 16mbyte virtual address sapce. cp67 was modified to provide 370 virtual address spaces ... supporting all the 370 option combinations ... it had "shadow tables" that emulated the various 370 options (using the rules defined for the hardware TLB, table lookaside buffer) ... which mapped the 370 virtual machine virtual address spaces (2k&4k pages, 64k&1m segments) to the 370 virtual machine space. This was in regular use on 360/67 a year before the first 370 hardware engineering machine was operational with hardware virtual memory support. basically vm370 adopted the cp67 shadow table approach ... but mapped to 370 hardware tables instead of mapped to 360/67 hardware tables. -- virtualization experience starting Jan1968, online at home since Mar1970 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
