I agree. Replace the sticker ASAP (specially if you use fluorescent
lighting, which is rich in UV, or if the storage receives direct
sunlight), and DO NOT make photographs of the board with flash (which,
again, generates more UV than visible light, even if in a short burst).
Camera flashes are amazingly powerful. The first run of Raspberry Pi 3
used a power supply regulator with a defective packaging, which let UV
pass. Because of that, tacking a photograph with flash while the
Raspberry was working made it reboot. The currents induced on the
regulator by the UV emitted by the flash made it behave erratically for
a few milliseconds - enough for the main processor to shut down and restart.
By the way: any room devoted to classic computer storage should not use
fluorescent lighting, sunlight or any other source of light rich in UV.
Not only because of EPROMs, but also to keep the cases from yellowing
(also caused by UV). LED lights are ideal (they don't emit UV), but
incandescent bulbs are acceptable.
Sincerely,
Antonio Rodríguez
On 1/12/2017 at 17:42, mike stedman wrote:
If I had to guess, the window on that chip indicates that it is
probably a UV-erasable EEPROM. It most likely shipped with a sticker
to keep it from being erased, which has now fallen off. I'd probably
put a new sticker on there to block the sunlight and keep it from
getting wiped.
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