- Status flags are a key part of most processors, indicating if an arithmetic result is negative, zero, or has a carry, for instance. In this post, I take a close look at the flag circuitry in the Intel 8086 processor (1978), the chip that launched the PC revolution.1 Looking at the silicon die of the 8086 reveals how its flags are implemented. The 8086’s flag circuitry is surprisingly complicated, full of corner cases and special handling. Moreover, I found an undocumented zero register that is used by the microcode.
- Saint Edward State Park (wta.gov)
Hike through a diverse century-old second-growth forest with a dense canopy to the undeveloped shoreline of Lake Washington. This historic 316-acre state park, nestled in the midst of the Seattle metropolitan area, has playground facilities for children, picnic areas, trails for mountain bikers and fields for sports teams as well.