The spaStatusBytePosition build descriptor option specifies the position of a segmentation status byte in the IMS™ scratch pad area (SPA). The byte is used by EGL runtime.
The spaStatusBytePosition build descriptor option is ignored if the value of the spaSize build descriptor option is 0 (in which case no SPA is available) or if the program is invoked by an immediate program switch (in which case the segmentation status byte is the last byte of the SPA).
If the program receives control from an IMSADF II program, the value of spaStatusBytePosition may be any integer between 15 and 28, inclusive. Otherwise, the value may be 15 or may equal the value specified for the spaSize build descriptor option; in the latter case, the segmentation status byte is the last byte of the SPA.