About the RAM?

how would you know that a sure type of RAM will be able to be read by a motherboard? we're upgrading a crappy matured emachines model t1840

Answer:
Look it up at http://www.18004memory.com/

You will see this:
eMachines eMachines T1840

System Specs
Type of system: Desktops/Servers
Bus Architecture: PCI
Native OS: Windows XP Home
CPU Type: 1.80GHz Intel Celeron
Comments: 400MHz FSB
System Memory
Standard Memory: 128 MB (removable)
Maximum Memory: 1.0 GB
Maximum Expansion: 2 sockets
Comments: PC2100 DDR SDRAM DIMMs

If you have solitary 128MB, then consider going for the MAX. Get TWO 512MB modules at $49.00 respectively at www.18004memory.com

They guarantee that it will WORK, and will BUY your old RAM from you. They are totally awesome to work near.

I would not call your eMachine any OLD or CRAPPY. Just don't expect it to do Windows Vista. You can still get replacement parts, even the power supply from http://www.newegg.com

Good luck and Happy Computing!
Best to look it up on the Internet. You enjoy to get the correct type/brand of memory for your motherboard.
Download Belarc Advisor and return with the name and model of the motherboard. consequently go to the manufacturer's website and see what Ram it uses
the association is http://www.belarc.com
If all else fail Google it...The answer to your question is a max of 1GB of memory on the mobo and the type individual 2- 512mb DDR PC2100. (You can use PC2700 also as they are backwards compatible...I Know, I went from PC2100 to PC2700 on mine.)
http://configurator.oempcworld.com/resul...
you want DDR PC2100
i would suggest getting 2x 256MB sticks and throwing out your old-fashioned 128MB stick (not literally, just stick surrounded by in on of the boxes from the exotic sticks and put it in a drawer)
heres a cooperation
http://www.tigerdirect.com/applications/...
check the box the motherboard comes in. or check the manufacturer's website
To determine your option and prices, go to crucial.com and press "Scan My System"
http://www.crucial.com/index.asp...
Just do not go and get hi-performance RAM. They tend to be more suitable on enthusiast motherboards that have a wider length of memory voltage settings. Proprietary boards have set settings to prevent overclocking.

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