Assembler
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Little Man Computer
Instruction Set
| Code | Name | Description |
|---|---|---|
| 0 | HLT | Stop (Little Man has a rest). |
| 1 | ADD | Add the contents of the memory address to the Accumulator |
| 2 | SUB | Subtract the contents of the memory address from the Accumulator |
| 3 | STA or STO | Store the Accumulator value at the memory address given. |
| 4 | This code is unused and gives an error. | |
| 5 | LDA | Load the contents of the memory address given into the Accumulator. |
| 6 | BRA | Branch - use the address given as the address of the next instruction |
| 7 | BRZ | Branch to the address given if the Accumulator is zero |
| 8 | BRP | Branch to the address given if the Accumulator is zero or positive |
| 9 | INP or OUT | Input or Output. Copy Input to Accumulator if address is 1, copy Accumulator to Output if address is 2. |
| 9 | OTC | Output Accumulator as a character if address is 22. (Non-standard instruction) |
| 9 | DAT | Store the given number into memory. |
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