Microchip 256kbit EPROM 28-Pin PDIP, AT27C256R-70PU

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EPROM OTP (One Time Programmable)

These EPROM (Erasable Programmable Read-Only Memory) devices contain the same chips and are programmed in the same way as their UV-eraseable counterparts. However as the package contains no window, they cannot be erased and re-programmed.