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 proprietary protocol of Digital Equipment Corporation. MOP frames can be one of the following commands:[1]

CommandDescription
[memory load data]Contains memory load data.
[mem load request]Request for memory load segment.
[mem load w/addr]Memory load with transfer address.
[par load w/addr]Parameter load with transfer address.
[dump service req]Request for assistance with dump operation.
[mem dump request]Request for next memory dump segment.
[memory dump data]Contains memory dump data.
[dump completed]Acknowledgment of dump completion.
[volunteer assist]Offer of dump/load/loop assistance.
[request program]Request for system or loader program.
[rem boot request]Request for boot program.
[remote ID reqst]Request for remote console identification.
[remote system ID]Remote console identification information.
[counters request]Request for communication information counters.
[counters reply]Communication information counters.
[reserve console]Remote console in reserved state.
[release console]Release of remote console from reserved state.
[rem console poll]Poll of remote console for status.
[rem console rply]Response to remote console poll.
[loopback request]Request to loopback enclosed data.
[loopback reply]Response to loopback request with data.

See also

References

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