the running program and the operating system. Page addressing In some processor architectures, like that of the Intel 4004 4-bit processor, memory was divided into (256 byte) pages and special precautions had to be taken when the control flow crossed page boundaries, as some machine instructions exhibited different behaviour if located in the last few instructions of a page, so that only few instructions were recommended to jump between pages. See also Low memory – the first 64 KB of memory (segment 0) in DOS Page boundary relocation References Further reading Memory management