downstream on the North Fork Wallace River
- The Shaw Lake Trail starts on Sultan Basin Road and leads to the northernmost section of Wallace Falls State Park where it crosses the North Fork Wallace River and ends along Shaw Lake. Along the way it crosses several tributaries of Olney Creek.
- Two interesting XOR circuits inside the Intel 386 processor (righto.com)
Intel’s 386 processor (1985) was an important advance in the x86 architecture, not only moving to a 32-bit processor but also switching to a CMOS implementation. I’ve been reverse-engineering parts of the 386 chip and came across two interesting and completely different circuits that the 386 uses to implement an XOR gate: one uses standard-cell logic while the other uses pass-transistor logic. In this article, I take a look at those circuits.