I have started getting back into electronics and have been getting all my old IC chips organized into a simple storage solution. However, there are a few chips I have not been able to find any real information on.
The first one is the only one that returns any kind of internet search result. The ID number on it is DM74L93N. As far as I have found, I think it might be some kind of step counter. I haven’t been able to find out any more than that.
The other two chips don’t return any information at all. The manufacturer is NEC Japan. The number is either H760IT-726 or uPB7442C.