The full instruction set of the 8-bit computer.
The instructions can either reference a 4-bit memory address or a 4-bit value in the operand.
| # | Mnemonic | Name | Opcode | Operand | Flags set | Flags read | Description |
|---|---|---|---|---|---|---|---|
| 0 | NOP | No operation | 0000 | Unused | Do nothing for a cycle | ||
| 1 | LDA | Load the accumulator | 0001 | Memory reference | Put the value of the referenced memory address into the A-register | ||
| 2 | ADD | Add | 0010 | Memory reference | CZ | Put the value of the referenced memory address into the B-register, and put the sum of A+B into the A-register | |
| 3 | SUB | Subtract | 0011 | Memory reference | CZ | Put the value of the referenced memory address into the B-register, and put the sum of A-B into the A-register | |
| 4 | STA | Store the accumulator | 0100 | Memory reference | Store the value of the A-register into the referenced memory address | ||
| 5 | LDI | Load immediate | 0101 | Value | Put the value from the operand into the A-register | ||
| 6 | JMP | Jump | 0110 | Memory reference | Jump to the instruction at the referenced memory address | ||
| 7 | JC | Jump if carry | 0111 | Memory reference | C | Jump to the instruction at the referenced memory address if the carry flag is set | |
| 8 | JZ | Jump if zero | 1000 | Memory reference | Z | Jump to the instruction at the referenced memory address if the zero flag is set | |
| 14 | OUT | Output | 1110 | Unused | Output the value of the A-register on the 7-segment display | ||
| 15 | HLT | Halt | 1111 | Unused | Halt the computer |