INTERVIEW QUESTIONS MAINFRAME JCL DETAILS

Question: What is difference between addressing mode and residential mode

Answer: Addressing mode specifies the architecture used, ie 24 bit addressing mode or the 31 bit addressing mode,ie, Amode=24 or Amode=31.

The residential or Rmode is used to specify whether or not the job exists above or below the 16Mb line, ie, where it is resident.

Addressing mode specifies the architecture used, ie 24 bit addressing mode or the 31 bit addressing mode,ie, Amode=24 or Amode=31.

The residential or Rmode is used to specify whether or not the job exists above or below the 16Mb line, ie, where it is resident.
Source: CoolInterview.com

Addressing Mode/Access Mode
AMODE(24) indicates 24-bit (three-byte) addressing - memory below the line.
AMODE(31) indicates 31-bit addressing - memory above and below the line.
AMODE=ANY indicates the program may use either of the addressing technique.
Run Mode/Residency Mode
RMODE(24) indicates that the program must be loaded into memory below the line
RMODE(31) indicates that the program can be loaded either below or above the line.
RMODE=ANY indicates that the program can be run in either 24 bit (below)or 31 bit memory (above). Source: CoolInterview.com

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