To process a sequential data set or members of a PDS or PDSE, you can use BSAM or QSAM. You can be in 31-bit addressing mode when issuing BSAM and QSAM macros. Data areas can be above the 16 MB line for BSAM and QSAM macros, and you can request that OPEN obtain buffers above the 16 MB line for QSAM. This permits larger amounts of data to be transferred.