Emulating records in one record format in another record format

Details Emulating records in one record format in another record format Emulating records in one record format in another record format

1992-07-15

1994-04-05

Shaw, Dale M.

G06F 1300

Patent

active

053013042

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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