Computercraft: turtle for cobblestone generator

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--             Vril's               --
-- turtle for cobblestone generator --
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local bFreeSpace = true
local itemcount = 0

term.clear()
term.setCursorPos(3,6)
term.write("I'll work while there's free space")
term.setCursorPos(9,7)
term.write("in the chest under me.")

turtle.select(1)
while bFreeSpace do
    if turtle.detect() then
        turtle.dig()
        sleep(0.1)
        itemcount = turtle.getItemCount(1)
        if itemcount == 64 then
            bFreeSpace = turtle.dropDown()
        end
    end
    sleep(0.2)
end
term.clear()