- Queen Anne is a neighborhood and geographic feature in Seattle, Washington, United States, located northwest of downtown. Queen Anne covers an area of 7.3 square kilometers (2.8 sq mi), and has a population of about 28,000. It is bordered by Belltown to the south, Lake Union to the east, the Lake Washington Ship Canal to the north and Interbay to the west.
- The Z-80 has a 4-bit ALU. Here’s how it works. (righto.com)
The 8-bit Z-80 processor is famed for use in many early personal computers such the Osborne 1, TRS-80, and Sinclair ZX Spectrum, and it is still used in embedded systems and TI graphing calculators. I had always assumed that the ALU (arithmetic-logic unit) in the Z-80 was 8 bits wide, like just about every other 8-bit processor. But while reverse-engineering the Z-80, I was shocked to discover the ALU is only 4 bits wide! The founders of Zilog mentioned the 4-bit ALU in a very interesting discussion at the Computer History Museum, so it’s not exactly a secret, but it’s not well-known either.