Instruct CPU to execute Ram Instruction

[desmondling78]

Hi,

I have a CPU. So this CPU have basic elements such as RAM and ROM.
My program is written in the ROM memory.
2 questions to ask the gurus of assembly

1) How can I move the instructions on the ROM to the RAM of the CPU?
Inside a CPU, because instructions or data are inside the ROM, how can I specifically, copy these instructions to the CPU RAM?

2) Next how can I instruct CPU to run the program entired only the RAM itself?

I know this is weird, since its perfectly fine running the program ROM. But I need to rewrite the ROM data. In any case, any help to my desperate situation will be greatly appreciated! Thanks