XS and non-XS interfaces

In addition to the XS interface, which permits 31-bit addressing, the “old” non-XS interface, with 24-bit addressing, is supported for reasons of compatibility. This means that programs with 24-bit addressing can be executed without conversion, depending on the Assembler presettings.
The user can then profit from the larger user address space of 16 Mbytes. Conversely, programs which use 31-bit addresses can still be executed in the lower address space. Programs with 24-bit addressing can also be linked with programs with XS capability.