Architecture
The differences among ESA/390, ESA/XC, z/Architecture®, and z/XC architectures that might affect application programs are described,
including differences among the following elements:
- PSWs
- Registers
- Storage addressing
- I/O handling
- Assembler language instructions
Architectures are defined in other publications:
- ESA/390 architecture is defined in IBM Enterprise Systems Architecture/390 Principles of Operation, SA22-7201.
- ESA/XC architecture is defined in z/VM: ESA/XC Principles of Operation.
- z/Architecture is defined in IBM z/Architecture Principles of Operation, SA22-7832.
- z/XC architecture is defined in z/VM: z/Architecture Extended Configuration (z/XC) Principles of Operation.