5.3 ARCHLVL (Set architecture level)

5.3.1 Function

The ARCHLVL system parameter specifies the initial architecture mode. Additional ARCHLVL statements
may be specified to enable or disable specific facilities, to override the STFLE (Store Facility List Exten-
ded) response and force it to return a certain (incorrect) bit pattern or to display the status (enabled or
disabled) of facilities during startup. An overview of all architecture facilities can be found in “

5.3.2 Syntax

Descriptive

or

ARCHLVL facility

or

ARCHLVL facility ALL]

or

bitno

Diagram

¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬ÊÍ

or

Êʬ¬¬ ARCHLVL ¬¬¬§¬¬¬ ¬¬¬¬§¬¬¬ facility ¬¬¬§¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬§¬¬¬¬¬¬¬¬¬ÊÍ

or

~¬¬¬¬¬ ALL ¬¬¬¬¬¬®

Êʬ¬¬ ARCHLVL ¬¬¬ ¬¬¬¦¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¦¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬ÊÍ

facility

or

Êʬ¬¬ ARCHLVL ¬¬¬§¬¬¬ ¬¬¬¬§¬¬¬ bitno ¬¬¬§¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬§¬¬¬¬¬¬¬¬¬¬¬¬ÊÍ

5.3.3 Parameter

S/370

Use S/370 for OS/360, VM/370 and MVS 3.8.

ESA/390

Use ESA/390 for MVS/XA, MVS/ESA, OS/390, VM/ESA, VSE/ESA, Linux/390 and ZZSA.
zOS can be run until version 1.2 with ESA/390 mode without installed bimodal feature or
until version 1.4 if the bimodal feature is installed.

ESAME

Use ESAME (Enterprise System Architecture, Modal Extensions) for z/OS, z/VM, z/VSE
and z/Linux. The ESAME mode is equivalent to z/Archtecture mode at at Architecture
Level 2.

When ESAME is specified, the machine will always be IPL’ed in ESA/390 mode but the
system is capable of being switched into the z/Architecture mode after IPL. This is
handled automatically by all z/Architecture operating systems.

z/ARCH

Use z/ARCH for z/OS, z/VM, z/VSE and z/Linux. z/ARCH is similar to ESAME. The z/Arch
mode is equivalent to z/Architecture mode at Architecture Level 3.

ENABLE

Enable the specified facility. If no architecture mode is given as additional parameter the
facility is enabled for all architecture modes.

DISABLE

Disable the specified facility. If no architecture mode is given as additional parameter the
facility is disabled for all architecture modes.

facility

The name of the facility that has to be enabled, disabled or displayed. An overview of all
architecture facilities can be found in “

bitno

The bit number of the facility that has to be enabled or disabled. The format of bitno is
BITnn, e.g. “BIT44” (Bit 44 = PFPO Facility Bit). An overview of all architecture facilities
can be found in “

QUERY

Display the settings for the specified facility.

ALL

Specifies that all facilities have to be displayed.

5.3.4 Examples

Example 1:

Set the architecture level to S/370.

ARCHLVL S/370