Table 3—Six monitor commands are available. The half-duplex communications are handled on a single pin. Note that the monitor will echo each input byte received.
| Command | Op-byte | Operand | Return | Action |
| READ | $4A | ADRSH:ADRSL | Contents of specified address | Retrieve value located at 16-bit address |
| WRITE | $49 | ADRSH:ADRSL:DATA | None | Put value into 16-bit address location |
| IREAD | $1A | None |
Contents of next two addresses (auto incrementing) |
Retrieve the next two values located at the last 16-bit address + 1 and address + 2 |
| IWRITE | $19 | Data | None | Put value into the last 16-bit address + 1 |
| READSP | $0C | None | SP + 1 as 2 bytes SPH:SPL | This allows you to locate the stack. You can alter the PC loaded on the stack at SP+5:SP+6. |
| RUN | $28 | None | PULH and RTI | Unload the stack and execute at PC |