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perhaps you mean ROM, but your question is unclear. not all computers have ROM. some ROM is indeed writable (e.g. PROM, UVPROM, EPROM, EEPROM, Flash ROM), but writing is much slower than reading and often requires nonstandard voltages not normally available in the operating computer. early ROM technologies even required physical rewiring of their circuits to change their contents... but it could be changed.

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11y ago

What else can I help you with?