- Here be dragons: Preventing static damage, latchup, and metastability in the 386 (righto.com)
I’ve been reverse-engineering the Intel 386 processor (from 1985), and I’ve come across some interesting circuits for the chip’s input/output (I/O) pins. Since these pins communicate with the outside world, they face special dangers: static electricity and latchup can destroy the chip, while metastability can cause serious malfunctions. These I/O circuits are completely different from the logic circuits in the 386, and I’ve come across a previously-undescribed flip-flop circuit, so I’m venturing into uncharted territory. In this article, I take a close look at how the I/O circuitry protects the 386 from the “dragons” that can destroy it.
- Cabinda Province (Wikipedia)
Cabinda (formerly called Portuguese Congo, Kongo: Kabinda) is an exclave and province of Angola, a status that has been disputed by several political organizations in the territory. The capital city is also called Cabinda, known locally as Tchiowa, Tsiowa or Kiowa. The province is divided into four municipalities—Belize, Buco-Zau, Cabinda and Cacongo.