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31-bit addressing

 
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purushoth_jp

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Joined: 12 Dec 2004
Posts: 22

PostPosted: Mon Dec 13, 2004 8:11 pm    Post subject: 31-bit addressing
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1.
can anybody help me to find out what is 31-bit addressing. it was introduced in cobol new verion. how we can implement this in cobol.

2. what is data independence (logical and physical) plz don't give me the definition. plz explain me.
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jz1b0c

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Joined: 25 Jan 2004
Posts: 160
Location: Toronto, Canada

PostPosted: Mon Dec 13, 2004 9:55 pm    Post subject:
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Great Day!

Each program has an addressing mode (AMODE) and residency mode (RMODE) associated with it at link-edit time. The AMODE can be 24, 31, or ANY. Many programs from the days of MVS Version 1 still execute in 24-bit mode, but programs which need to address storage above the 16 megabyte line must execute in 31-bit mode. During execution, the mode can be changed using the BSM or BASSM instructions, but it is more common for each program to execute in one mode only - the initial mode is set by the fetch process depending on the AMODE of the program. At any time, the current mode is indicated by the high-order bit of the next instruction address in the PSW, which is 1 in 31-bit mode and 0 in 24-bit mode. this is available in releases from ESA.this is related to hardware
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jz1b0c

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Joined: 25 Jan 2004
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Location: Toronto, Canada

PostPosted: Tue Dec 14, 2004 1:14 am    Post subject:
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Great Day!

Regarding data independence, please go thru the link,
I got it from google search

Code:
http://www.arches.uga.edu/~chinnant/Data%20Independence%20(6).ppt
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purushoth_jp

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Joined: 12 Dec 2004
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PostPosted: Tue Dec 14, 2004 8:24 pm    Post subject: 31 bit addressing
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hi masade

thanks for ur valuable reply.
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