- Reverse-engineering the adder inside the Intel 8086 (righto.com)
The Intel 8086 processor contains many interesting components that can be understood through reverse engineering. In this article, I’ll discuss the adder that is used for address calculations. The photo below shows the tiny silicon die of the 8086 processor under a microscope. The left part of the chip has the 16-bit datapath including the registers and the Arithmetic-Logic Unit (ALU); you can see the pattern of circuitry repeated 16 times. The rectangle in the lower-right is the microcode ROM, defining the execution of each instruction.
- Report of the International polar expedition to Point Barrow, Alaska, in response to the resolution of the [U.S.] House of representatives of December 11, 1884 (archive.org)
The Secretary of War has the honor to transmit to the House of Representatives the report of the International Polar Expedition to Point Barrow, Alaska, together with the letter of the Chief Signal Officer of the Army, of this date, submitting the report to this Department, the same being furnished in response to the resolution of the House of Representatives of December 11, 1884, as follows : “Resolved, That the Secretary of War be requested to transmit to the House of Representatives, if not inconsistent with the public service, the report of the International Polar Expedition to Point Barrow, Alaska, by Lieut. P. H. Ray, U. S. Army, for the years 1881, 1882, and 1883.” ROBERT T. LINCOLN, Secretary of War.