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 ...

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 ...

Ben Eater and others use an instruction processing sub-cycle where a given op code is executed as a sequence of microcode instructions. My thoughts (Aug 2019) on microcoded instructions such as those ...

From chip-red-pill/uCodeDisasm: The microcode of the Intel Atom CPUs consists from two large chunks of data – Microcode Triads and Sequence Words. These data are ...

My understanding was that a CPU microcode update is stored in non-volatile memory on the motherboard and is loaded by the BIOS or UEFI into volatile memory on the CPU during boot. And because the ...

Infosec boffins have released a tool to decrypt and unpack the microcode for a class of low-power Intel CPUs, opening up a way to look at how the chipmaker has implemented various security fixes and ...