There are indeed such systems. Embedded systems (which are frequently programmed in assembly or 'C' code). Such systems very often map a small bit of high-spe

There are indeed such systems. Embedded systems (which are frequently programmed in assembly or 'C' code). Such systems very often map a small bit of high-speed (on chip) RAM to the first few bytes of address space. I very distinctly recall such an embedded system in a college course.