Missle Launch

term.clear()
term.setCursorPos(1,1)

print("Korean Launch Terminal")
print(" 1 - Commence Countdown & Launch")
print(" 2 - Lock Terminal")
print(" 3 - Terminal Reboot")
print(" 4 - Terminal Shutdown")
while true do
event, param1, param2, param3, param4 = os.pullEvent()
if event == "char" and param1 == "1" then
term.clear()
term.setCursorPos(1,1)
print("Launch Commencing In T-Minus...")
print("30 Seconds")
sleep(10)
term.clear()
term.setCursorPos(1,1)
print("Launch Commencing In T-Minus...")
print("20 Seconds")
sleep(10)
term.clear()
term.setCursorPos(1,1)
print("Launch Commencing In T-Minus...")
print("10 Seconds")
sleep(10)
term.clear()
term.setCursorPos(1,1)
print("Commencing Launch")
redstone.setOutput("back", true)
sleep(2)
redstone.setOutput("back", false)
end
end