On Sat, Jun 12, 2021 at 12:39 AM Jon Elson via cctalk <cctalk@classiccmp.org> wrote: > > On 6/11/21 3:22 PM, Santo Nucifora via cctalk wrote: > > The 74151 is an 8:1 multiplexer with complementary outputs. > > The 74157 is a quad 2:1 mux. > > I can't imagine any defect that would cause one to test out > as the other.
In both cases it would require an input pin to become an output, something that I can't see how it would happen. I wonder if in the original list, a '1' was misread as a '7' or vice versa. I am told that in some countries the '7' is conventionally written with a crossbar across the downstroke to avoid this. My father always did this, for all it is not common in England. -tony > > > Jon >
