CyberSlug Rules!
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Machine Language and instruction codes
Machine language:
- Is the only language a computer can understand
- It is extremely simple, but very tricky for humans
- Each computer type may have a different machine language
- In the computer memory, there is no difference between a number or an instruction code. They all look the same.
Example: The slug computer
- Each memory location can accomodate 4 digits ( plus sign)
- First two digits - may represent an instruction code
- Next two digits - may represent an address in memory
0 3 2 9 - In the above example the code is: 03, the address is 29
Practice with the slug computer
OP codes for the slug computer
| OP code | Operation |
| 0 | NOP - next instruction |
| 1 | Load accumulator |
| 2 | Store accumulator to memory |
| 3 | Add memory to accumulator |
| 4 | Subtract memory from accumulator |
| 5 | Multiply memory by accumulator |
| 6 | Divide accumulator by memory |
| 7 | Jump unconditionally |
| 8 | Jump if ACC <=0 |
| 9 | Input value |
| 10 | Output (display) value |
| 99 | Stop |
| any other | NOP |