is a ROM physically present on the board like the RAM?

By timbuzgil ·
I was recently trying to explain some stuff to some guy on the RAM and the ROM. I actually could not identify the ROM on the board.

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Hard to identify these days

by oldbaritone In reply to is a ROM physically prese ...

for a couple of reasons - first, many chipsets have the ROM integrated one of the chips, and second, true ROMs are scarce now.

These days, it's much more likely that there will be a block Flash ROM memory inside one of the interface chips, and it's not truly Read-Only because it can be re-written if done in a special way (like BIOS Flash). Often, there may be ROM and RAM inside the same chip.

The days of mask ROMs and EPROMS are pretty well over. If you want to find one, look for a dinosaur in the boneyard and open it up.

Or search for "2764 photo"

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ROM is on the motherboard

by Stephen570 In reply to is a ROM physically prese ...

The most commonly cited "ROM" on the motherboard is the system BIOS, which is really EEPROM.

Do a search for images on Google or Bing for "motherboard bios" and you will find several pictures that illustrate what the BIOS chip looks like and where you might find it.

See http://www.ultrabios.com/faq.php and http://www.ultrabios.com/graphics/motherboard.jpg for examples.

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Read Only Memory

by TheChas In reply to is a ROM physically prese ...

Bits of fact in both of the other answers.

For the last 15 or so years, the only ROM in a standard computer is the Flash programmable BIOS ROM. Look near the CMOS battery and clear CMOS jumper for an IC with a silver label on it, that will be the Flash ROM.

The CMOS memory chip that holds the BIOS settings is still a RAM device.

By standard definition, a ROM is a device that is programmed with a fixed set of code that normally cannot be changed.

Perhaps the best example of a ROM based system is the original Nintendo and Super Nintendo game systems that used plug in ROM cartridges for each game. Or even further back, the Atari 2600 system.

For current technology, the vast majority of electronic devices and gadgets have either mask or Flash programmed ROM that holds the basic operating software. Be it an automated thermostat, your car, TV or cell phone, all have firm-ware software stored in the device.


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