JCL

2GB - Maximum region available for Job through REGION parameter.
8 - Maximum length of stepname/ddname/operation name.
15 - Maximum number of Jobs steps in a JCL.
15 - Maximum Instream Procedure in a Job.
16- Maximum number of extents for PS.(Extents - Non contigeous memory locations on a volume.)
20 - Maximum length of Programer Name.
22 - Maximum number of qualifiers in dataset name.
44 - Maximum lengthl of dataset name (Including periods).
80 - Maximum number of charecters in one line/record can be passed to Program through ACCEPT.
100 - Maximum number of characters passed through PARAM parameter.
123 - Maximum number of Extents for VSAM.
142 - Maximum number of characters coded in Accounting Information.
255 - Maximum number of EXEC steps in a Job.
255 - Maximum number of buffers coded in DCB parameter (BUFNO).
255 - Maximum number of JOB steps in a Procedure.
255 - Maximum number of generations within one GDG.
3273 - Maximum number of DD statemets in a single EXEC.
4095 - Maximum comparision code in COND condition.