First of all, the parts that don't work properly, don't work properly. The ones that work properly do in all cases. However, the specific detail is that while the parts that work some of the time, reset on power-up OK, they alway fail to reset on the pushbutton, regardless of whether there's a 1232 in the circuit or not. The parts that work normally, do that regardless of whether there's a reset IC or that comparator-based reset circuit I described.

These are AMD parts. The history on those two Intel HMOS parts is that they were replaced back in 1980-something with other parts and I was going to figure out what their failure mode, if any was, but haven't done so. I've tossed out most of the non-functional AMD parts, which was about 70 (a dozen rails) of the 88 parts. I should have checked them out when I got them, but that was in the '80's. I still have three, each of which fails to reset from the pushbutton, but which (only) appears to run when power-on reset happens. None of these malfunctioning parts behave normally, and I haven't verified much of anything except that they're broken. I'm not going to mess with them much longer. The Dallas parts work just fine no matter what I do and that's good enough for me. After all, I'm interested in parts that drop-in in place of the old parts, and I'm not presently interested in SMT packaging for 805x-types.

Remember, my subject in this thread is, essentially, incoming inspection so that I don't have this sort of thing happening to me again. I need parts in stock, that actually work. These were sold to me as new, never used or otherwise examined parts, and I still have the invoice. Hamilton Avnet doesn't exist any longer, however. It's all because distributors don't mind cheating the small purchaser, as they can't hurt their business much.

RE