- Read-only memory (ROM) refers to memory chips storing permanent data and instructions.
- The data on most ROM chips cannot be modified
TYPES OF ROM
PROGRMMABLE READ-ONLY MEMORY (PRAM)
• Is a blank ROM chip on which a programmer can write permanently.
ERASABLE READ-ONLY MEMORY (ERAM)
- These chips can be erased and rewritten a number of times.
ELECTRICALLY ERASABLE PROGRAMMABLE READ-ONLY MEMORY (EEPROM)
• Allows a programmer to erase the microcode with anelectric
signal
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