Here is some read only memory i have buit. I will most likely be using this design in my next computer project, feel free to use it in any of your own projects if it happens to be exactly what you need for what ever unlikely reaosn.
It has 256 bytes of memory (2048 bits)
How it works: The inputs are at the right, the binary number you input on those wires will "point" at one of the bytes of memory and output it to the lines on the left.

Remember to give a diamond if you like it. :)