MF-VS

OS/390

DATA SET ---DS

COUPLE DATA SET-----CDS

INITIAL PROGRAM LOAD—IPL

PART 1  VIRTUAL STORAGE

EVOLUTION:

60 HARDWARE  --PREFIX  S

SOFTWARE     --PREFIX  OS

OS/360   WITHOUT VS                  PCP

LOAD ALL INSTRUCTION AND DATA INTO  CENTRAL PROCESSOR

COST  EXPENSIVE

ONE JOB SUBMITED PER TIME

24 ADDRESSING –16MB CENTRAL STORAGE

MULTI FIXED TASK –MULTIVARIABEL TASK

70  VIRTUAL STORAGE MVS

24 BIT 

SINGLE VIRTUAL STORAGE   SVS

ALL USES SHARE ALL 16MB VIRTUAL

CONCEPT  ---NO PHYSICAL EXISTS

PAGING 

MULTIVIRTUAL STORAGE 

16MB FOR EACH USER

80  XA  MVS/XA  EXTENDED ARCHITECH  (ONE MVS)

31BIT

80 MIDDLE AGE

ESA/370(HAREDWRE)  MVS/ESA  ENTERPRISED

31 BIT

N *2GB FOR EACH USER

90  ESA/390   OS/390  (N MVS)

LOOSE COUPLE – BASIC SYSPLEX ---PARALLEL SYSPLEX 

2000   ZERO DOWN TIME Z SERIES Z/OS

64 BIT