Multiple problems without abstraction |BM360 a Memory divided into 2-KB blocks and each one with a 4-bit protection key a PSW also has a 4-bit protection key a Hardware will trap any attempt tries to access memory with a protection code different from PSW keyMultiple problems without abstraction ◼ IBM 360 ❑ Memory divided into 2-KB blocks and each one with a 4-bit protection key ❑ PSW also has a 4-bit protection key ❑ Hardware will trap any attempt tries to access memory with a protection code different from PSW key