At 14:35 2/12/2009 Thursday, Andrew Bosch wrote:
>The DD parameter and the associated DD line is derived from the old IBM
>JCL (Job Control Language). It's purpose was to provide data to batch
>commands for processing within the batch job script.
HASP running under IBM MFT or MVT (VM/CMS hadn't been invented, though predecessor had) on an IBM 7000 series e.g., IBM 7074. HASP then was take over by IBM and productized as JES2. Users' group called SHARE.
I'm sure others will chime in :-)
/Pete