Abstract: An IBM eServer zSeries™ system uses various types of microcode (firmware) that implement functions such as the execution of complex instructions in the CPUs, I/O operations performed by the ...

Hardware guru Ken Shirriff is working on a simulator for the IBM S/360 Model 50 mainframe, launched in April 1964. His program runs the original machine's microcode so it can control and be controlled ...

MythSim is a visual microcode simulator. It can take microcode, along with program code and data stored in memory, and "run" the code, with the computed results being written to memory. The user can ...

Many thanks to the original authors for their work and inspiration. This project is a complete rewrite of the original codebase to improve code quality, maintainability and add new features. It also ...

Google researchers recently published proof-of-concept code demonstrating the ability to create malicious microcode patches on AMD processors from Zen 1 through Zen 4. This vulnerability would allow ...

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 ...