Identifying the origin of the data space

Some processors do not allow the data space to start at zero; these data spaces start at address 4096 bytes. When you use DSPSERV CREATE, you can count on the origin of the data space staying the same within the same IPL. To learn the starting address, either (1) create a data space of 1 block of storage more than you need and then assume that the data space starts at 4096 or (2) use the ORIGIN parameter. If you use ORIGIN, the system returns the beginning address of the data space at the location you specify.

Unless you specify a size of 2 gigabytes and the processor does not support an origin of zero, the system gives you the size you request, regardless of the location of the origin. An example of the problem you want to avoid in addressing data space storage is described as follows:

Suppose a program creates a data space of 1 megabyte and assumes the data space starts at address zero when it really begins at the address 4096. Then, if the program uses an address lower than 4096 in the data space, the system abends the program.