r/AskEngineers

description

Engineers apply the knowledge of math & science to design and manufacture maintainable systems used to solve specific problems. AskEngineers is a forum for questions about the technologies, standards, and processes used to design & build these systems, as well as for questions about the engineering profession and its many disciplines.

There’s a different leader in Syria now. Many of the members of Congress of both parties who have gone to Syria in recent months have said they believe he’s a reformer. US Secretary of State Hillary Clinton, CBS Face The Nation interview (27 March 2011)

Reverse-engineering the ModR/M addressing microcode in the Intel 8086 processor (righto.com) One interesting aspect of a computer’s instruction set is its addressing modes, how the computer determines the address for a memory access. The Intel 8086 (1978) used the ModR/M byte, a special byte following the opcode, to select the addressing mode.1 The ModR/M byte has persisted into the modern x86 architecture, so it’s interesting to look at its roots and original implementation.