The reason I want this is because I want to use a program that allows me to download a hex file to RAM and run off that ... I am extremely new at this

Are you aware that the '51 is Harward arcitechture (I.e. to run from RAM it has to be written, then configured as "ROM" to be read as code.

AS a newbie, you need to read the 3 80C51_FAM documents:
http://www.semiconductors.philips.com/products/...other.html