MODCB

Changes the contents of certain fields by inserting specified values in the fields.

Several different forms of the manipulative macroinstructions exist. In addition to the standard form, there are the following:

List form
Generate form
Remote list form
Execute form.

These alternate forms can be used by reentrant programs or by programs sharing with other programs the parameter lists created when the macroinstructions are executed. See Forms of the manipulative macroinstruction, for the other forms of the manipulative macroinstructions.

Rather than using the manipulative macroinstructions, the program can include macroinstructions that are supplied by IBM® to generate DSECTs for each kind of control block. Each DSECT shows the field names and possible values that each field can contain. These names and values can be used in assembler language instructions to set and test designated fields. See Using DSECT-creating assembler instructions and macroinstructions for details.