520cdtv System Board
| Jumper | Description | Function | 
| P1 | Speed Select | 
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| P2 | Processor Select | 
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| P5 | CMOS Erase | Remove and replace jumper P5 to clear CMOS and Password | 
| Connectors | Description | Function | 
| J16 | TV Board - I/O Address Connector | Connect to TV Board | 
| J11 | Replacement Battery Connector | Use only 4.5v Alkaline Computer Battery | 
