On 5/25/2016 6:51 AM, Peter Hunkeler wrote:
So, just to be sure my memory is correct: On the hardware, the C, K and D fields are separate blocks of data separated by GAPs, right? It is only DFdss that combines the when printing.
Yes and no. On true physical CKD devices that would be true. On today's emulated devices it isn't.
I believe that DFDSS PRINT uses a Read-count-key-data command CCW to read data. The count, key, and data would be then be combined and returned by the control unit as a single block of data which is subsequently formatted by DFDSS.
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