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Video gamers know about cheat codes, but assembly language programmers are often in search of undocumented instructions. One way to find them is to map out all of a CPU’s opcodes and where there are ...

Continuing his reverse-engineering of the Intel 8087, [Ken Shirriff] covers the conditional tests that are implemented in the microcode of this floating point processing unit (FPU). This microcode ...

Gregory Tang and Rajat Bahl, AMD, Inc. Alex Wakefield and Padmaraj Ramachandran, Synopsys Inc. As microprocessor designs have grown considerably in complexity, the use of hand-written directed tests ...

Something to look forward to: Intel's plan to address voltage-related crashes on desktop processors with a patch has some worried that performance and overclocking will take a hit. Past updates to ...

In a nutshell: Google researchers recently disclosed a stealthy security flaw dubbed "EntrySign" that allowed malicious code execution through unsigned microcode patches on AMD processors from Zen 1 ...