Hi,
I was trying to use an old ps2 magtek stripe reader, this one:
It was working years ago, but after that I just stored the device. Now the red led stays lit and the reader sings a little song (probably reporting a failure: low tone, high, high, low, high, high, ...) I checked inside and the only thing strange is a rusted crystal labelled MMD160AK (I guess is 16 mhz?). Is there a way to quickly check this?
I had several crystals, and using a 16 mhz the song continues but sometimes the led just stays red, no song.
Any hint? Is not sending anything thru the ps2 port, only 0xFF bytes when connecting.