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2. Programmable ROM - Wikipedia

   en.wikipedia.org/wiki/Programmable_ROM

   It is one type of read-only memory (ROM). PROMs are used in digital electronic devices to store permanent data, usually low level programs such as firmware or microcode. The key difference from a standard ROM is that the data is written into a ROM during manufacture, while with a PROM the data is programmed into them after manufacture. Thus ...

3. Zilog Z8 - Wikipedia

   en.wikipedia.org/wiki/Zilog_Z8

   A 16-bit address space for between 1 kibibyte (KB) and 64 KB of either programmable read-only memory (PROM, OTP), read-only memory (ROM), or flash memory, are used to store code and constants, and there is a second 16-bit address space which can be used for large applications.

4. Read-only memory - Wikipedia

   en.wikipedia.org/wiki/Read-only_memory

   Read-only memory (ROM) is a type of non-volatile memory used in computers and other electronic devices. Data stored in ROM cannot be electronically modified after the manufacture of the memory device. Read-only memory is useful for storing software that is rarely changed during the life of the system, also known as firmware.

5. EEPROM - Wikipedia

   en.wikipedia.org/wiki/EEPROM

   EEPROM or E 2 PROM (electrically erasable programmable read-only memory) is a type of non-volatile memory. It is used in computers, usually integrated in microcontrollers such as smart cards and remote keyless systems , or as a separate chip device, to store relatively small amounts of data by allowing individual bytes to be erased and ...

6. Firmware - Wikipedia

   en.wikipedia.org/wiki/Firmware

   Firmware is stored in non-volatile memory – either read-only memory (ROM) or programmable memory such as EPROM, EEPROM, or flash. Changing a device's firmware stored in ROM requires physically replacing the memory chip – although some chips are not designed to be removed after manufacture.

7. EPROM - Wikipedia

   en.wikipedia.org/wiki/Eprom

   An EPROM (rarely EROM), or erasable programmable read-only memory, is a type of programmable read-only memory (PROM) chip that retains its data when its power supply is switched off. Computer memory that can retrieve stored data after a power supply has been turned off and back on is called non-volatile .