Voltage In Binary Out

Is there a way to build a milli-volt meter that measures low voltages and displays the voltage in binary code form. I want to sample a voltage between +0.0 volts and +2.56 volts aprox., and display the results in binary, using 8 LEDs in a row. Zero volts would be ( 00000000 ) and 2.56 volts would be ( 11111111 ) Eventually to be used to interface a small voltage sourse with the parallel port on my computer. It seams that there should be a IC to do this. Anyone have a solution?

I am presently using a dot/bar driver (LM3914), which gives 10 seperate
codes over the 0 - 2.5 volt voltage range.

example:

00000000
10000000
01000000
00100000
up to
00000001

ps What is a Tag

Google for LPT ADC and you'll get lots of sites with projects which connect an ADC to the parallel port like this one:
LPTScope hardware

Thanks for the info kchriste