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EPROMS usually have a paper sticker glued onto them. As the sticker had details printed on them. The glue on most printer-compatable stickers gets old with age
by Tangurena 18y ago
EPROMS usually have a paper sticker glued onto them. As the sticker had details printed on them. The glue on most printer-compatable stickers gets old with age and thus they fall off.
Due to pricing quirks, the EPROMs with windows were far cheaper than the same chips that didn't have quartz windows on them. They weren't ROMS, they were the same IC, but with an opaque lid.
- joe_bleau 18y agoFunny, I remember windowed ceramic parts as being quite a bit more expensive than epoxy plastic with no window, which would be a OTP (one time programmable) EPROM. Use the high dollar windowed devices during development or for unstable projects, then switch to plastic OTP once the code settles down for better production margins. The good stickers we used were metallized polyster, I think. They were a bit more opaque than paper, as measured by the time it took to UV erase a device.
- Tangurena 18y agoI'm sure things have changed, but the last time I made stuff with EPROMs was back in the 80s. When cleaning out a garage back in the late 90s, I threw out several old arcade video games (She Who Must Be Obeyed had commanded it), and the stickers had fallen off all the EPROMs.
- nopassrecover 18y agoI'm sure that if there were a safety issue with the windowed versions cost wouldn't have been an issue.