Xinu - Name is the reverse of Unix. Small, elegant, multitasking OS with concurrent processing, message passing, ports, semaphores, memory management, buffer pools, uniform device I/O, shell, Tcl, TCP/IP. Begun as means to teach OS design concepts, now used by many education institutions; some embedded system makers have ported it to their hardware: Intel 80960, 8096; Motorola 680x0.
Dennis Brylow's Xinu Lab Infrastructure Page - Keeps the Xinu Millennium Edition: first port to a modern RISC architecture: PowerPC G3 and G4. Marquette University Department of Mathematics, Statistics and Computer Science..
Douglas Comer - Xinu creator, Distinguished Professor of Computer Science, Purdue University; information, essays, affiliations..
PDP-11 Xinu - Directory with Xinu OS for LSI-11 PDP-11 series of 16-bit computers; distribution has SunCHIP (a.k.a. CHIP) C compiler and assembler, both written in C. Unix archive. The Unix Heritage Society, Unix Archive..
Xinu - Growing article, with links to many related topics. Wikipedia..