1 02/20/86 unlock_mca
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 3 Syntax as a command:  unlock_mca MCA_NUMBER
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 6 Function: Unlocks (enables) console input to the MCA specified by the
 7 MCA_NUMBER. This can be issued at ring 1 or ring 4.
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10 Arguments:
11 MCA_NUMBER
12      is  the decimal  number of  the MCA  to be  unlocked, and is
13      required.