northwest geology field trips
- Field trip to the Wells Creek volcanics, North Fork Nooksack River (nwgeology.wordpress.com)
The Wells Creek Volcanic Member of the Nooksack Formation (Tabor and others, 2003; see refs below) is found in the vicinity of Nooksack Falls, east of Glacier, Washington. These Middle Jurassic island arc rocks form steep yellowish cliffs along the Mount Baker Highway (Route 542) just east of the Excelsior Pass trailhead, where they crowd the highway against the deep gorge of the North Fork Nooksack River…
- Reverse-engineering the surprisingly advanced ALU of the 8008 microprocessor (righto.com)
A computer’s arithmetic-logic unit (ALU) is the heart of the processor, performing arithmetic and logic operations on data. If you’ve studied digital logic, you’ve probably learned how to combine simple binary adder circuits to build an ALU. However, the 8008’s ALU uses clever logic circuits that can perform multiple operations efficiently. And unlike most 1970’s microprocessors, the 8008 uses a complex carry-lookahead circuit to increase its performance.