- Life on the Mississippi is a memoir by Mark Twain of his days as a steamboat pilot on the Mississippi River before the American Civil War published in 1883. It is also a travel book, recounting his trips on the Mississippi River, from St. Louis to New Orleans and then from New Orleans to Saint Paul, many years after the war.
- The 8085’s register file reverse engineered (righto.com)
On the surface, a microprocessor’s registers seem like simple storage, but not in the 8085 microprocessor. Reverse-engineering the 8085 reveals many interesting tricks that make the registers fast and compact. The picture below shows that the registers and associated control circuitry occupy a large fraction of the chip, so efficiency is important. Each bit is implemented with a surprisingly compact circuit. The instruction set is designed to make register accesses efficient. An indirection trick allows quick register exchanges. Many register operations use the unexpected but efficient data path of going through the ALU.