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EPROM eraser is used to complete the operation of chip erasure. Ultraviolet light shines through the hole, and the data inside the chip can be erased. Through this window, you can see the integrated circuit inside. A glass window is opened on the ceramic package on its front. Generally, it is only suitable for occasions with small demand or verification before ROM mass production.ĮPROM chip can be erased and written repeatedly, which solves the disadvantage that Prom chip can only be written once. Prom has the same characteristics as ROM, but its cost is higher than ROM, and the speed of writing data is slower than that of ROM mass production. If there is an error, the written chip can only be scrapped. Users can write their own data with a special programmer, but this opportunity is only once. There is no data in the prom originally made in the factory. Due to the inconvenience of ROM manufacturing and upgrading, prom was invented later. If any error is found in the data, it can only be discarded. Once burned, the user can only verify whether the written data is correct and can not make any modification. The content can only be read and cannot be changed. the data inside ROM was burned in the ROM manufacturing process in the factory with special methods. In the early stage of microcomputer development, BIOS was stored in ROM. 1、 The development history of EEPROM and EPROM is different