- The Z-80’s 16-bit increment/decrement circuit reverse engineered (righto.com)
The 8-bit Z-80 processor was very popular in the late 1970s and early 1980s, powering many personal computers such as the Osborne 1, TRS-80, and Sinclair ZX Spectrum. It has a 16-bit incrementer/decrementer that efficiently updates the program counter and stack pointer, as well as supporting several 16-bit instructions and memory refresh. By reverse engineering detailed die photographs of the Z-80, we can see exactly how this increment/decrement circuit works and discover the interesting optimizations it uses for efficiency.
- Mount Erie (Washington) (Wikipedia)
Mount Erie is a mountain on Fidalgo Island in Skagit County, Washington, United States. It is on public park land owned and managed by the city of Anacortes and is located in the south of the Anacortes Community Forest Lands.