I inherited three of these Texas Instruments vintage ICs, marked N286 (regular size) and M26 (unusually large). The smaller pairs of digits on the right hand side, 74 and 18, are, I assume, the manufacturing date. Does anyone have any info on what these are?
I assume the date code is 18th week of 1974. They are in a standard 16 pin plastic DIP. I can't find any information about them, and the format of the marking isn't one I've come across before:
The underside is more than normally verbose too, marked E175A2M, in case that is of any help:
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