Coding MODE, CODE, TRTCH, KEYLEN, or PRTSP in the DCB macro makes the program device-dependent. However, they can be specified in the DD statement.

DEVD —Specify DA if any DASD might be used. Magnetic tape and unit-record equipment DCBs will fit in the area provided during assembly. Specify unit-record devices only if you expect never to change to tape or DASD.

KEYLEN—Can be specified on the DD statement or in the data class if necessary.

RECFM, LRECL, BLKSIZE—These parameters can be specified in the DD statement, data class, or data set label. However, you must consider maximum record size for specific devices. Also, you must consider if you want to process XLRI records.

DSORG—Specify sequential organization (PS or PSU) to get the full DCB expansion.

OPTCD—This parameter is device dependent; specify it in the DD statement.

SYNAD—Any device-dependent error checking is automatic. Generalize your routine so that no device-dependent information is required.