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DeepHack: Digital spelunking for the 21st Century


Secret Motor

The original Secret Motor was a project by Mike Kan circa 1993 to visualize memory access on a Macintosh using an oscilloscope. The QEMU Secret Motor is an attempt to create something similar using an emulator. It currently consists of a patched version of qemu which prints the x86 EIP for each cycle of the emulated machine, and a python script (based on this YouScope emulator) to visualize that data. TODO: post some video here of the qemu secret motor running.


QEMU is a generic and open source machine emulator and virtualizer.


Linux 3.4 timer fixes

Patches for resume and 32-bit timer overflow

(Potential) fix for Linux leapsecond bug

1 July 2012

Avoiding unnecessary overflow in sched_clock

15 November 2011

The Elements of Computing Systems


MMIX is a 64-bit RISC machine used in Volume 4A of Donald Knuth's Art of Computer Programming and it will eventually be used in all other volumes of that series.

Open Computation Hardware

The OR1200 is an open-source synthesizable CPU.

What Every Programmer Should Know about Computer Memory

A 7-part series by Ulrich Drepper (complete PDF):


CorePy: Assembly Programming from Python

Patterson & Hennesy

Java tutorial based on "Computer Architecture" and "Computer Organization and Design"

Operating Systems

Systems-level software (kernel and userspace)

Unix V6


A Plumber's Wish List for Linux

Looking for a useful systems software project? Version 2 of the list by Kay Sievers (20 Oct 2011).

Linux 0.01

Minix 3

Roadmap including ARM support.

Temporal Hex Dump

Personal tools