Ken Shirriff's blog

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

The 8085 processor uses a PLA (programmable logic array) to control much of the activity within the processor, such as instruction decoding ...

In this article, I show how overflow is computed in the 6502 microprocessor at the transistor and silicon level. I've discussed the mat...

The overflow flag on the 6502 processor is a source of myth and confusion. In this article, I explain signed and unsigned binary arithmetic...

Have you ever wanted to write a program when the only computer available is your phone? You can use an Android phone to write and run Jav...

In this article I tear down a 4-port USB charger of puzzling origin. This charger is a huge step above the $2 counterfeit chargers I examine...