- The Book of Leviticus (/lɪˈvɪtɪkəs/, from Ancient Greek: Λευιτικόν, Leuïtikón; Biblical Hebrew: וַיִּקְרָא, Wayyīqrāʾ, ‘And He called’; Latin: Liber Leviticus) is the third book of the Torah (the Pentateuch) and of the Old Testament, also known as the Third Book of Moses. Many hypotheses presented by scholars as to its origins agree that it developed over a long period of time, reaching its present form during the Persian Period, from 538 to 332 BC, although this is disputed.
- Reverse-engineering the 8085’s decimal adjust circuitry (righto.com)
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.