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Boot ROM
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<p>Boot ROM is a piece of <a href="/facts/Read-only_memory/P9QMuDLH">read-only memory</a> (ROM) that is used for <a href="/facts/Booting/j6N1kRpc">booting</a> a computer system. It contains instructions that are run after the CPU is reset to the <a href="/facts/Reset_vector/rfAcxhw9">reset vector</a>, and it typically loads a <a href="/facts/Bootloader/6sNpcLMK">bootloader</a>. There are two types of boot ROM: a <a href="/facts/Mask_ROM/P9QMuDLH">mask boot ROM</a> that cannot be changed afterwards and a writable boot ROM such as an <a href="/facts/EEPROM/0yAMFY0I">EEPROM</a> or a <a href="/facts/Flash_memory/Cn8JsStx">flash memory</a> chip. </p>