Computer system with downward compatibility function

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G06F 500

Patent

active

057991898

ABSTRACT:
A method and apparatus is disclosed for moving a unit of data (such as an object, program, or file) from a computer operating at a current release level N to a computer operating at a previous release level N-M in a manner that assures that the unit of data will function predictably when restored to the previous release without having to make modifications or updates to the N-M level computer system. This invention allows a new release to be gradually phased in for a distributed computing system instead of requiring that all computers be upgraded to the new release before any units of data can be moved between systems.

REFERENCES:
patent: 4498142 (1985-02-01), Advani et al.
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patent: 4627019 (1986-12-01), Ng
patent: 4788637 (1988-11-01), Tamaru
patent: 4809170 (1989-02-01), Leblang et al.
patent: 4875159 (1989-10-01), Cary et al.
patent: 4947366 (1990-08-01), Johnson
IBM AS/400 System to System/38 Record Copy Facility PRPQ Specifications Oct., 1988.
Upward and Downward Compatibility Between Non-Compatible Profiles--IBM Technical Disclosure Bulletin vol. 28 No. 9 2/86 p. 4073.
Expanded Control Information Recorded in Nondestructive Memory During Coexistence of Multiple Releases of a Product --IBM Technical Disclosure Bulletin vol. 24 No. 7A 12/81 pp. 3204-3206.
Management of Programming Compatibility within a System of Separate Dependent Elements --IBM Technical Disclosure Bulletin vol. 31 No. 8 1/89 pp. 317-320.
Improved Buffering for Printer Device Driver--IBM Technical Disclosure Bulletin vol. 28 No. 11 4/86 p. 5068.

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