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Once programmed, the information pattern in the memory can be erased (restored to the all "1" state) by ultraviolet light before packaging or by exposure to X-ray radiation as described in Section I. The ability to erase before packaging allows for complete testing of the memory chip prior to shipment, which is a distinct advantage over once-programmable ROMs. Erasure of information in packaged devices by placing them in a commercially available X-ray generator allows for correction of programming errors as well as unpredictable future pattern modifications.

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Once programmed, the information pattern in the memory can be erased (restored to the all "1" state) by ultraviolet light before packaging or by exposure to X-ray radiation as described in Section I. The ability to erase before packaging allows for complete testing of the memory chip prior to shipment, which is a distinct advantage over once-programmable ROMs. Erasure of information in packaged devices by placing them in a commercially available X-ray generator allows for correction of programming errors as well as unpredictable future pattern modifications.
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Tube❄️Time (tubetime@mastodon.social)'s status on Friday, 02-May-2025 15:45:19 JST Tube❄️Time
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the first EPROM devices were intended to be erased using X-rays, but ultraviolet light turned out to be a more practical method (X-rays can damage chips).

In conversation about 24 days ago from mastodon.social permalink