https://www.codecademy.com/learn/paths/computer-science
The code for this project is largely designed by Codecademy authors, I do not take full credit for it. I did however add a couple of methods of my own to the UltraSuperCalculator class as well as error catching in some areas of the code. I also added a "Binary Template" at the bottom of main.py to aid the user in sending instructions to the program.
Overall this was just a really cool project to build.
As a result I ended up learning a lot about how ISA's (Instruction Set Architecture) function such as:
CISC (Complex Instruction Set Computer)RISC (Reduced Instruction Set Computer)MIPS (Microprocessor without Interlocked Pipelined Stages)
USCC (Ultra Super Calculation Computer) Headquarter's Instruction Set Architecture
System Design:
- Four function calculator
- Can only operate on numbers stored in registers
- Processor receives binary data as 32-bit strings
- Returns results to the terminal
- Can operate on 10-bit numbers (0 thru 1023)
- Results can be negative (5 - 10 = -5)
Instruction format:
- 32 bit's in length
- Binary data will come to the CPU as a string
- Registers (32 total on CPU, 0-indexed)
- 0 thru 21: Available for number storage
- 0: Constant 0
- 22 thru 31: Available for history storage
+=======+=======+=======+=======+=======+=======+=======+=======+
| 0: 0 | 1: | 2: | 3: | 4: | 5: | 6: | 7: |
+-------+-------+-------+-------+-------+-------+-------+-------+
| 8: | 9: |10: |11: |12: |13: |14: |15: |
+-------+-------+-------+-------+-------+-------+-------+-------+
|16: |17: |18: |19: |20: |21: |22: H0 |23: H1 |
+-------+-------+-------+-------+-------+-------+-------+-------+
|24: H2 |25: H3 |26: H4 |27: H5 |28: H6 |29: H7 |30: H8 |31: H9 |
+=======+=======+=======+=======+=======+=======+=======+=======+
- Bits 0-5 are OPCODEs
- use variable 'opcode' in program
- Bits 6-10 & 11-15 are source register locations
- use variables 'source_one' and 'source_two' in program
- Bits 16-25 are reserved for adding a new value to the registers
- use variable 'store' in program
- Bits 26-31 are functions
- use variable 'function_code' in program
+--------+----------+-------------------------------------+
| OPCODE | FUNCTION | Definition |
| 000000 | 100000 | Add two numbers from registers |
| 000000 | 100010 | Subtract two numbers from registers |
| 000000 | 011000 | Multiply two numbers from registers |
| 000000 | 011010 | Divide two numbers from registers |
| 000001 | 000000 | Store value to next register |
| 100001 | 000000 | Return previous calculation |
+--------+----------+-------------------------------------+
Image credit: Codecademy
