The ??DUMP (Dump Memory) command invokes a nonfatal memory dump.
For more information about memory dump processing, refer to
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Memory Dump Processing
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Memory Dump Commands
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The ??MEMDP (Dump Memory) primitive command
Syntax

Explanation
??DUMP
Invokes a nonfatal memory dump.
??DUMP <text>
Invokes a nonfatal memory dump. The first 18 characters of the text appear in the memory dump as the reason for the dump.
??<mix number> DUMP
Invokes a program dump of the task identified by the mix number.