- 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.
- Eatonville, Washington (Wikipedia)
Eatonville is a town in Pierce County, Washington, United States. It is 32 mi (51 km) south of Tacoma. The population was 2,845 at the 2020 census. The town motto is “Better Together.”