sentences:  An instruction set that tried to provide every possible access mode for every possible instruction (like the DEC VAX) was known as "orthogonal", then considered the paragon of design.This style of memory access with wide variety of modes led to instruction sets with hundreds of different instructions, a style known today as CISC (Complex Instruction Set Computing).By the late 1970s memory had become cheap, but at the cost of lower performance; CPU designs now ran many times faster than the memory they talked to.