From ComputerCraft Wiki
|As of ComputerCraft 1.6, turtles may have items added to (or even removed from!) them outside of the crafting grid. If a valid item exists in the currently selected inventory slot, this command places it on the turtle's left side. If an item was already present there, it'll be placed back into the inventory in the currently selected slot (assuming it's not taken up by eg an item that the turtle couldn't equip). Both actions can be performed in one go, allowing turtles to instantly swap tools.|
Turtles may equip mostly any item they could be crafted together with.
|Returns||boolean was the item equipped successfully?|
|Executed on a standard melee turtle (with a sword on its left side), and assuming a diamond pick is in the currently selected inventory slot, turns it into a miner turtle.|