One thing to remember about it is how UNIX's I/O model is designed for 64kB total of memory space on simplistic mid-range (at best) computer. While trying to fi

One thing to remember about it is how UNIX's I/O model is designed for 64kB total of memory space on simplistic mid-range (at best) computer. While trying to fit in concepts from 36bit Multics machine whose I/O primitive was equivalent of mmap().