- Counting bits in hardware: reverse engineering the silicon in the ARM1 processor (righto.com)
How can you count bits in hardware? In this article, I reverse-engineer the circuit used by the ARM1 processor to count the number of set bits in a 16-bit field, showing how individual transistors form multiplexers, which are combined into adders, and finally form the bit counter. The ARM1 is the ancestor of the processor in most cell phones, so you may have a descendent of this circuit in your pocket.
- NGC 6025 (Wikipedia)
NGC 6025 (also known as Caldwell 95) is an open cluster located 2,700 light years away in the Triangulum Australe constellation. It was discovered by Abbe Lacaille in 1751 during his expedition to the Cape of Good Hope.