You have a choice of creating a standard hiperspace or an ESO hiperspace. The standard hiperspace is backed with expanded storage and auxiliary storage, if necessary. Through the buffer area in the address space, your program can view or "scroll" through the hiperspace.

• HSTYPE=SCROLL on DSPSERV creates a standard hiperspace.
• HSPSERV SWRITE and HSPSERV SREAD transfer data to and from a standard hiperspace.

The ESO hiperspace is backed with expanded storage only. It is a high-speed buffer area, or "cache" for data that your program needs.

• HSTYPE=CACHE on DSPSERV creates an ESO hiperspace.
• HSPSERV CWRITE and HSPSERV CREAD transfer data to and from an ESO hiperspace.