Refers to a type of ROM that can be erased using an ultra violet light and then reprogrammed using a PROM Programmer. These chips have a small transparent area on the top, this is where the UV light is directed to clear the contents, they come in various different packages which make them very versatile. The ROM will retain the data until it is exposed again to an ultra violet light, it is normal practise to cover the small transparent area to avoid any potential data loss.

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