> Anyone ever use a CDP1802? I never used it but I remember hearing a talk at the IEEE Cherry Hill test conference by a guy who built a hardware fault simulator for the RCA 1802 for NASA-JPL. I think it was this guy: < https://ntrs.nasa.gov/search.jsp?R=3D19800012553 > As I recall the 1802 was the first CMOS micro and you could get it built/qualified for space use (ceramic packaging, Silicon on Sapphire, etc.). Anyway, I remember in the Q&A someone asked him something to the effect of: "why bother with hardware fault simulation?" his response was: "our customer returns come in the form of fireballs" --=20 Best Regards, Chuck Olson, WB9KZY Jackson Harbor Press --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .