We encounter another small problem when we mess with memory. Some memory addresses will allow us to read what is there, but will NOT allow us to write to them. Memory that we can both read from and write to is called RAM, which stands for Random Access Memory. This means that we can put numbers into these kinds of memory locations as well as look at what they already contain. The other kind of memory is called ROM, Read Only Memory. It is just what its name implies - we can only read what number is inside a ROM location not change it.

Now the next logical question is how do you know which is which? We will simply tell you as we go through the locations.

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