SCF Reference Manual for the Storage Subsystem (G06.24+, H06.03+)

Storage Subsystem Commands
SCF Reference Manual for the Storage Subsystem529937-007
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REPLACE SAC Command
FIRMWARE [[$volume.]subvol.]filename
specifies the name of the new EMU firmware file. The file must exist, and it must
have file code 0. The default volume and subvolume is the current SYSnn.