The IBM PCjr 4860 Computer System is a vintage desktop computer manufactured by IBM in the United States. The model is IBM PC Jr, known for its compact size and capabilities. This system comes with a keyboard, making it a complete package for vintage computing enthusiasts looking to experience the early days of personal computing technology. IBM's reputation for quality and innovation make this computer system a valuable piece of technology history.This has upgraded memory (640 kb) but has the H boot up error. I took pictures of the inside. Not sure what the green stuff is that found its way onto the circuit board. Monitor for sale as well (pick up only). Don’t want to risk shipping this.