ROM: Read Only Memory
Read Only Memory is constructed from "hard-wire logic," in a similar way to the processor, meaning that it cannot be reprogrammed or changed. This is because it is designed to perform a specific function, and does not need to be altered. An example of ROM is a commercial CD purchased from a store; the manufacturers do not want you to alter what is stored on the disk. ROM is only programmable once. For example, it could be programmed at the factory where they make the chip. And indeed, it’s usually used in firmly hardcoded chips made by the company.
PROM: Programmable Read Only Memory
Programmable Read Only Memory can be programmed using specific software only available to companies producing PROM chips. PROM can be likened to burning to a CD only once and reading from it many times. This is similar to ROM except that you, the consumer, can program it. You can buy a blank chip and have a PROM programmer program it with your stuff. But, once you program it, you can never change it.
Read Only Memory is constructed from "hard-wire logic," in a similar way to the processor, meaning that it cannot be reprogrammed or changed. This is because it is designed to perform a specific function, and does not need to be altered. An example of ROM is a commercial CD purchased from a store; the manufacturers do not want you to alter what is stored on the disk. ROM is only programmable once. For example, it could be programmed at the factory where they make the chip. And indeed, it’s usually used in firmly hardcoded chips made by the company.
PROM: Programmable Read Only Memory
Programmable Read Only Memory can be programmed using specific software only available to companies producing PROM chips. PROM can be likened to burning to a CD only once and reading from it many times. This is similar to ROM except that you, the consumer, can program it. You can buy a blank chip and have a PROM programmer program it with your stuff. But, once you program it, you can never change it.
No comments:
Post a Comment