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The x04 Proccessor and ISA

The x04 Processor is a virtual, theoretical CPU which has a 4 bit data width.

Where can I find this?

If you haven't read already, it is not real. It has been constructed in Minecraft however.

The ISA

Each instruction takes up 1 byte. One half is the opcode, the other is for specifying numbers to load into registers or for addressing memory. Here are some opcodes.

0100 - Loads the next nibble into A
        0110 - Loads the next nibble into B
        0001 - Adds A and B and saves the answer to register O
        1001 - Copies register O into the specified memory location