DOS versions DOS/360 and successors

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1 dos versions

1.1 tos/360
1.2 dos/360
1.3 dos/vs
1.4 dos/vse
1.5 ssx/vse
1.6 vse/sp
1.7 vse/esa
1.8 z/vse





dos versions
tos/360

tos/360 (tape operating system/360, not dos such , not called) ibm operating system system/360, used in days around 1965 support ibm 360 model 30 , similar platforms.


tos, per tape in name, required tape drive. shared of code base , manuals ibm s dos/360.


tos went through 14 releases, , discontinued when disks such ibm 2311 , ibm 2314 became more affordable @ time of system/360, whereas had been expensive luxury on ibm 7090.


dos/360

dos/360 primary operating system small midsize s/360 installations.


dos/vs

dos/vs released in 1972. first dos/vs release numbered release 28 signify incremental upgrade dos/360. added virtual memory in support of new system/370 series hardware. used fixed page table mapped single address space of 16 megabytes partitions combined.


dos/vs increased number of partitions (separate simultaneous programs) 3 (named background, foreground 1 , foreground 2) 5 (bg , f1 through f4) , allowed system wide total of fifteen subtasks.


dos/vs succeeded dos/vse through z/vse.


dos/vse

dos/vse introduced in 1979 extended version of dos/vs support new 4300 processors. 4300 systems included feature called ecps:vse provided single-level storage both processor , i/o channels. dos/vse provided support ecps:vse, run on system/370 without feature. vse last free version of dos.


ssx/vse

ssx/vse ( small system executive ) attempt ibm simplify purchase , installation of vse providing pre-generated system containing os , popular products. ssx released in 1982, , later replaced vse/sp.


vse/sp

in 1986 ibm released vse/sp ( system product ) in conjunction announcement of 9370 processors. vse/sp replaced ssx/vse , bundled vse popular vse program products such vse/af, acf/vtam, cics, , power/vs. vse/sp supported 24-bit addresses, despite customer requests provide xa (31 bit) version.


vse/esa

vse/esa 31-bit dos/vse version, released in 1990 support 384 mb of real storage. provided twelve static partitions , allowed vse/power , acf/vtam run in private address spaces. introduced new feature called dynamic partitions allow 150 concurrent jobs, each in own address space. version 1 run in either esa or 370 mode, esa mode supporting xa hardware limitations. version 2 supported esa mode esa hardware.


z/vse

ibm released z/vse 3.1 in 2005. change in naming reflected new system z branding ibm s mainframe product line, did not represent fundamental change in architecture vse/esa 2.7 preceded it. in particular, did not support new 64-bit z/architecture, running in 31-bit mode on 64-bit capable machines. z/vse 4.1 released in 2007 introduced support 64-bit real addressing, 8gb of memory. however, while parts of supervisor run in 64-bit mode, provides 31-bit virtual address spaces problem state applications. of 2011 1 estimate placed number of sites using z/vse @ around 4000.








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