Rom ： read only memory ; internal storage device in which information is permanent 只读存储器：只读存储器；内部存储设备，信息是永久存在的。
Prom ： programmable read only memory ; once programmed the switch pattern on a prom cannot be changed 可编程序的只读存储器：可编程的只读存储器；一旦被编程， prom的转换方式就不能被改变。
The eprom erasable programmable read only memory is used to solidify program so as to make the original program stored for a long time Eprom只读存储器固化程序，使原程序长期不至丢失
Harmonized system of quality assessment for electronic components . fusible link programmable read only memories . blank detail specification 电子元器件质量评估协调体系.熔断片可编程只读存储器.空白详细规范
Eprom ： erasable programmable read only memory : switch pattern in circuit can be erased by exposure to ultraviolet light 可擦可编程只读存储器：可擦可编程只读存储器：暴露于紫外线光就可以擦除电路控制方式。
Harmonized system of quality assessment for electronic components ; blank detail specification : mos ultra - violet light erasable electrically programmable read only memories silicon monolithic circuits 电子元件质量评估协调体系.空白详细规范.第1130部分
