Emulating records in one record format in another record format
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United States of America Patent
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-
Apr 5, 1994
Issued Date -
N/A
app pub date -
Jul 15, 1992
filing date -
May 20, 1988
priority date (Note) -
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status (Latency Note)
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Abstract
Count, key, data (CKD) datas are stored on fixed block (FBA) disk recorders (DASD). A virtual track is created which emulates a physical CKD track such that the byte displacement of each CKD record on the virtual CKD track is the same as the byte displacement would be on a physical CKD track. This enables computer programs using CKD formatted data to record on the FBA recorder in an emulation mode. Each FBA block includes a header outside the addressing of the virtual CKD track which includes a byte displacement pointer to the beginning of a first CKD record stored in the FBA block, if any begins in such FBA block; otherwise the header indicates that no CKD record begins in the block. A last record indicator is included in the count field emula-tion for assisting in finding end of the virtual track.
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