New International Version
And if you are willing to accept it, he is the Elijah who was to come.
Matthew 11:14 NIV
- Reverse-engineering the 8085’s ALU and its hidden registers (righto.com)
This article describes how the ALU of the 8085 microprocessor works and how it interacts with the rest of the chip, based on reverse-engineering of the silicon. (This is part 2 of my ALU reverse-engineering; part 1 described the circuit for a single ALU bit.) Along with the accumulator, the ALU uses two undocumented registers - ACT and TMP - and this article describes how they work in detail, as well as how the ALU is controlled.