This page is related to ROM chips
Transclude of block rom
Denis Apel Amiga Kickstart 2.06 ROM chip Image source
ROM (Read only memory) can be read from but not written to. This makes it ideal to store instructions that cant be corrupted for example the BIOS or UEFI system. ROM is usually written to from the manufacture and cannot overwritten.
Types
Over the years there have been several versions of ROM.
ROM
The oldest type of ROM which is programmed in the factory
PROM
Main wiki page: PROM A programmable type of ROM where data can be written to using a PROM programmer.
OTPROM
Main wiki page: OTPROM Similar to PROM but only one time programable.
EPROM
Main wiki page: EPROM Erasable PROM that can be erased using UV light.
EEPROM
Main wiki page: EEPROM A ROM that can be erased using electricity and can be programmed using electricity.