decimal adjust circuitry of
- In this post I reverse-engineer and describe the simple decimal adjust circuit in the 8085 microprocessor. Binary-coded decimal arithmetic was an important performance feature on early microprocessors. The idea behind BCD is to store two 4-bit decimal numbers in a byte. For instance, the number 42 is represented in BCD as 0100 0010 (0x42) instead of binary 00101010 (0x2a). This continues my reverse engineering series on the 8085’s ALU, flag logic, undocumented flags, register file, and instruction set.
- The Pentium as a Navajo weaving (righto.com)
Hurrying through the National Gallery of Art five minutes before closing, I passed a Navajo weaving with a complex abstract pattern. Suddenly, I realized the pattern was strangely familiar, so I stopped and looked closely. The design turned out to be an image of Intel’s Pentium chip, the start of the long-lived Pentium family. The weaver, Marilou Schultz, created the artwork in 1994 using traditional materials and techniques. The rug was commissioned by Intel as a gift to AISES (American Indian Science & Engineering Society) and is currently part of an art exhibition—Woven Histories: Textiles and Modern Abstraction—focusing on the intersection between abstract art and woven textiles.