MediaLB System Status Register
| RSTSYSCMD | Reset System Command Detected in the System Quadlet (cleared by writing a 0) |
| LKSYSCMD | Network Lock System Command Detected in the System Quadlet (cleared by writing a 0) |
| ULKSYSCMD | Network Unlock System Command Detected in the System Quadlet (cleared by writing a 0) |
| CSSYSCMD | Channel Scan System Command Detected in the System Quadlet (cleared by writing a 0) |
| SWSYSCMD | Software System Command Detected in the System Quadlet (cleared by writing a 0) |
| SERVREQ | Service Request Enabled |