You need 1.0 to 2.0 MB of storage space to run QMF. Additional storage space is required for other applications. For example, if you run QMF in a standard TSO environment with ISPF and GDDM, you need approximately 8.0 MB of storage space.
Most of the QMF modules are reentrant and can be loaded into EPLPA. The DSQCTOPX module must run in 24-bit mode below 16 MB; this module is also reentrant and can be loaded into PLPA.