RISC architectures, such as the SPARC and PowerPC, were designed to improve performance by reducing the number of instructions required to perform a task. RISC processors achieve this by using a large register file, simple instruction set, and a pipelined execution model. Superscalar architectures, such as the Intel Pentium and DEC Alpha, take this concept further by allowing multiple instructions to be executed in parallel.
To a casual user, it looks like a dry technical specification. But to a systems programmer or a digital archaeologist, those five words tell a dramatic story. 1994 was the year Unix faced its existential crisis. The "modern architectures" of the time—the MIPS R4000, the DEC Alpha, the HP PA-RISC, and the nascent Intel Pentium—were tearing apart the old assumptions of the 1970s and 80s. unix systems for modern architectures -1994- pdf
Curt Schimmel's 1994 text, UNIX Systems for Modern Architectures RISC architectures, such as the SPARC and PowerPC,
The most likely match is the book:
UNIX Systems for Modern Architectures is more than a historical artifact. It is a testament to the engineering spirit of the 1990s—a time when software engineers had to catch up to the hardware capabilities of the era. To a casual user, it looks like a
Hardware atomic instructions used to acquire and store locks without race conditions.
The 1994 "modern" VM system is the one we still use today: the with a global map.