Unknown TI logic series

I assume everyone now realises how pointless this is. Given working examples of TTL chips, particularly in a circuit where you can indentify the power and ground pins, it is next-to-triival to work out what they are. I've done it many times to deal with those idiots who think that scratching the numbers of standard ICs (and not just TTL) will somehow make it more difficult to work out what is going on. It doesn't! However, house nunbers do have sensible uses too. Perhaps the IC eas selected for some parameter. Perhaps it went through more testing. I've even met a case where several different ICs got the same house number. They were, IIRC, op-amps, and the point was that any of them would work in the circuits that specified that particular house number. I guess whichever was cheapeast at the time was used. And it meant that the production people didn't have to worry about what to fit. If it had the right house number on the package, it would work. One thing I do find curious about the origianl post is that the ALU is made of 1482s and 1483s. As I am sure you are aware, the 7482 and 7483 are adders, and would be logical (groan!) choices in an ALU (althoguh I've got a TTL-based calculator here that doesn't use any adder or ALU chip...). Perhaps I am reading too much into the numbners, though. I guess the OP doesn;'t want to desolder any of the ICs. I probsbly would, and then carefully experiment wtih them on a breadboard. -tony