Can random access memory be read only but not written?

Can random access memory only be read but not written?

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Random Access Memory (English: Random Access Memory, abbreviation: RAM), also called main memory, is an internal memory that directly exchanges data with the CPU.

It can read and write at any time (except when refreshing), and is very fast. It is usually used as a temporary data storage medium for the operating system or other running programs. When RAM is working, information can be written (stored) or read (retrieved) from any specified address at any time. The biggest difference between it and ROM is the volatility of data, that is, the stored data will be lost once the power is turned off. RAM is used in computers and digital systems to temporarily store programs, data, and intermediate results.

Related introduction:

Memory is a device or component used to store large amounts of information in digital systems. It is an important part of computers and digital devices. Memory can be divided into two categories: random access memory (RAM) and read-only memory (ROM).

Random access memory (RAM) can both store information into and read out information from designated units. Any information stored in RAM will be lost when the power is turned off, so RAM is volatile memory.

ROM is read-only memory. In addition to fixed storage of data, tables, and firmware programs, it is also widely used in combinational logic circuits.

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