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Maintenance Operations Protocol
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<p>The Maintenance Operation Protocol (MOP) is used for utility services such as uploading and downloading system software, remote testing and problem diagnosis. It was a <a href="/facts/Proprietary_protocol/o902Cmmh">proprietary protocol</a> of <a href="/facts/Digital_Equipment_Corporation/ztxs6keA">Digital Equipment Corporation</a>. MOP frames can be one of the following commands: </p> <table><tbody><tr><th>Command</th><th>Description</th></tr><tr><td>[memory load data]</td><td>Contains memory load data.</td></tr><tr><td>[mem load request]</td><td>Request for memory load segment.</td></tr><tr><td>[mem load w/addr]</td><td>Memory load with transfer address.</td></tr><tr><td>[par load w/addr]</td><td>Parameter load with transfer address.</td></tr><tr><td>[dump service req]</td><td>Request for assistance with dump operation.</td></tr><tr><td>[mem dump request]</td><td>Request for next memory dump segment.</td></tr><tr><td>[memory dump data]</td><td>Contains memory dump data.</td></tr><tr><td>[dump completed]</td><td>Acknowledgment of dump completion.</td></tr><tr><td>[volunteer assist]</td><td>Offer of dump/load/loop assistance.</td></tr><tr><td>[request program]</td><td>Request for system or loader program.</td></tr><tr><td>[rem boot request]</td><td>Request for boot program.</td></tr><tr><td>[remote ID reqst]</td><td>Request for remote console identification.</td></tr><tr><td>[remote system ID]</td><td>Remote console identification information.</td></tr><tr><td>[counters request]</td><td>Request for communication information counters.</td></tr><tr><td>[counters reply]</td><td>Communication information counters.</td></tr><tr><td>[reserve console]</td><td>Remote console in reserved state.</td></tr><tr><td>[release console]</td><td>Release of remote console from reserved state.</td></tr><tr><td>[rem console poll]</td><td>Poll of remote console for status.</td></tr><tr><td>[rem console rply]</td><td>Response to remote console poll.</td></tr><tr><td>[loopback request]</td><td>Request to loopback enclosed data.</td></tr><tr><td>[loopback reply]</td><td>Response to loopback request with data.</td></tr></tbody></table>