256x2=512
512mb = 0.5GB
That will depend more on the motherboard and chipset used than the processor. Motherboards of that era would probably support between 256 and 768 MB of RAM, Most likely, the largest size modules you can use is 256 MB, so multiply that by the number of RAM slots and you'll have agood idea of how much your board supports.
If you are asking if you can run Windows Vista on 256 MB of RAM, then yes. However, the Windows installer will not allow you to install on 256 MB of RAM without a patch. If you are asking if you can use Vista on a computer using 256 MB memory modules, then yes.
256
256 - 148 = 108
125
256 - 252 = 4
The number 256 in binary would be 100000000
256 Pounds is 432.32 US Dollars.
256 quarters are worth 64 dollars.
If the area of a rectangle is found by measuring the length times the width, then if you know the area is 256 and the width is 8, you find the length by dividing 256 by 8 which would give you a length of 32 centimeters.
256 centimetres (not cemtmeters!) = 100.8 inches, approx.
Without knowing what your motherboard is, I can only speculate on the problem. Most boards of that era should accept up to 512 MB of RAM, using two 256 MB SDRAM modules. Check that: 1. The RAM modules are both 256 MB modules. 2. They are seated correctly in the slot. 3. That one is not defective. If you only reach 256 MB of RAM, remove one, test, and then replace and remove the other one. 4. Some unscrupulous retailers will sell you a "low density" module that does not meet official JEDEC standards. These modules are built with slower and cheaper RAM chips, and will only work on certain chipsets. On Intel chipsets, they will fail to work at all, or will report an incorrect amount of memory.