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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
As you have already said - it's a ROM (Read Only Memory), it contains code to boot your computer up so it can access the network. This means you can have a computer without a hard drive, using the network file systems.
If it's an EPROM (rather than a ROM) you can erase it with UV light and reprogram it, you can easily tell - a UV eraseable EPROM will have a window in the chip for erasure.
If it's just a ROM, it's no use, except for booting your computer onto the network.
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