Ken Shirriff's blog

Processors all have status flags to keep track of conditions such as a zero value, a carry, or a negative value. Whenever you write a loop o...

On the surface, a microprocessor's registers seem like simple storage, but not in the 8085 microprocessor. Reverse-engineering the 8085...

The instruction set of the 8085 microprocessor has an underlying structure that becomes much clearer if expressed in an octal-based table,...

The 8085 microprocessor has two undocumented status flags: V and K. These flags can be reverse-engineered by looking at the silicon of the ...

The arithmetic-logic unit is a fundamental part of any computer, performing addition, subtraction, and logic operations, but how it works i...