If you do not code any of the parameters described here, the DCB macro does not create this portion of the block and OPEN will ignore any value that your program sets. You can code values to affect the macro expansion and change any of these fields before the end of the DCB OPEN exit routine. For more information on EXCP appendages, see Making Appendages Available to the System.

EOEA=symbol

Last two characters of an EOE appendage name that you have entered into SYS1.LPALIB or SYS1.SVCLIB.

PCIA=symbol

Last two characters of a PCI appendage name that you have entered into SYS1.LPALIB or SYS1.SVCLIB.

SIOA=symbol

Last two characters of a SIO appendage name that you have entered into SYS1.LPALIB or SYS1.SVCLIB.

PGFIX=YES

The SIO appendage includes a page-fix entry point. Refer to Using the EXCPVR macro instruction and Page Fix and EXCPVR Start I/O Appendage.

CENDA=symbol

Last two characters of a CHE appendage name that you have entered into SYS1.LPALIB or SYS1.SVCLIB.

XENDA=symbol

Last two characters of an ABE appendage name that you have entered into SYS1.LPALIB or SYS1.SVCLIB.

OPTCD=Z

Indicates that, for devices that have a magnetic tape reel (input only), a reduced error recovery procedure (four reads only) will occur when a data check is encountered. Only specify this operand when the tape is known to contain errors and the application does not require that all records be processed. Its proper use would include error frequency analysis in the SYNAD routine. Specification of this parameter will also cause generation of a foundation block extension. This parameter does not apply to magnetic tape subsystems that use cartridges. Your program can change this parameter value at any time.

IMSK=value

The IMSK parameter lets you specify whether or not you want to ignore system error routines:

• Code X'FFFFFFFF' to specify that you want the system to use the error routines.
• If you code any value other than X'FFFFFFFF', the system will not use the system's error routines. This causes one of the DCBIFOIOE bits to be set on. See DCBIFLGS.