The com.ibm.jzos.fields package of the IBM JZOS Batch Toolkit for z/OS is updated to support Data Access Accelerator (DAA) for high performance data marshalling and conversion. DAA support is enabled by default. To disable DAA support, explicitly set the system property com.ibm.jzos.fields.use-daa to false. In addition, the com.ibm.jzos.fields.BinaryAsIntField::setSigned(boolean) and com.ibm.jzos.fields.BinaryAsLongField::setSigned(boolean) APIs have been deprecated. When DAA is enabled, both methods will throw an UnsupportedOperationException. When DAA is disabled, their behavior remain unchanged.