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4917emu is an hypothetical microprocessor that was used in a computer course named COMP1917 at the UNSW University of New South Wales to teach microprocessor basics. It is 4bit, has 16 memory locations and 4 registers:
- Instruction Pointer (IP),
- Instruction Store (IS),
- General Register 0 (R0) and
- General Register 1 (R1).

Each memory location can store a number between 0 and 15, and there are 16 instructions.

There is a Extended Instruction Code set.

For example the following 4917 machine code program would print the numbers from zero to 15: 8 0 3 11 1 15 0.

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