Very small, interpreter under 1, 800 lines, has no graphics. Topic of classic Addison-Wesley book 'A Little Smalltalk'. Both by Timothy Budd, Oregon State University. [Free for non-commercial use]
A collection of papers on garbage collection, memory allocation, and the like from the OOPS Research Group at the University of Texas at Austin. Includes papers from the OOPSLA Workshops on Garbage Collection in 1990, 1991, and 1993.