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| | Introduction to Memory Types - RAM, ROM, SRAM, DRAM, PROM, EPROM, EEPROM, flash, NVRAM |
 | | Memories in the ROM family are distinguished by the methods used to write new data to them (usually called programming), and the number of times they can be rewritten. |
 | | This classification reflects the evolution of ROM devices from hardwired to programmable to erasable-and-programmable. |
 | | The contents of the ROM had to be specified before chip production, so the actual data could be used to arrange the transistors inside the chip. |
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