URSA RISC System Architecture

Mountains of abstraction make computer systems appear to be magical, but hidden within is a core with no magic in sight, in which the most difficult of tasks are broken down into nothing more than sequences of basic arithmetic and logic. This book is a guide to solving problems without all the abstraction, to direct communication with the computer. Everything is interpretation. To solve problems at this level, it is often useful to recognize that there is data in some shape in some location that needs to be placed into some other location and reshaped while in transit. With a handful of instructions and enough time, you are free to make anything that you can imagine.