I programmed many of these types of things back in the good old days. Didn't always work. Get a bad one about 1 out of 10. Just throw those in the trash. EEPROM came along and life was much better.
I miss EPROMs. I liked putting them into the UV light eraser and waiting 20 minutes. EEPROMs and EAROMs were much easier to work with but they lacked the fun of erasing them with light. I would save the adhesive write protect tabs from 5 1/4" disks to cover the windows on EPROMs to protect them from degradation or erasure. The best write protect tabs were matte black on a metalized adhesive film which blocked out everything and looked very professional. Also it was fun looking at EPROMs under a microscope to see the tiny features and occasional interesting marks, codes and pictures added to the die by the designers. Here's a small collection of chip art: http://smithsonianchips.si.edu/chipfun/graff.htm (smithsonianchips.si.edu)
Gee another old timer. Not many of us left.
Yeah, we're getting rare these days. Though electronics as a hobby has picked up again, the good old days of through hole components, wire wrapping and dumb test equipment (analog scopes, analog meters, logic probes, etc.) will always be the golden age to me. I'm not old enough to have worked with vacuum tubes much except as a novelty, but I do love me some CMOS magic like old Don Lancaster used to cook up. Ah, the good old days.
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