F.SMCD - return the name of the device containing the SMC.

smcdev = f.smcd( dup );

smcdev: is the right-justified, zero-filled, three-character BCD device name of the device where the SMC is found.
dup: is an optional argument. If supplied, it must have a value of zero or one to indicate if the primary or duplicate SMC device is wanted. If "dup" is one and there is no duplicate SMC, F.SMCD will return a zero.

F.SMCD returns the BCD name of the device where the primary System Master Catalog (SMC) is stored. At most sites this will be "ST1".