So, about a month ago I built in FTB a replica of the Swan Station from LOST and here is the programm I created :)/> .
For those that don't know. This timer counts down 108 minutes and if no redstone signal is applied within the given time to the right of the computer, it shows some glyphs and emmits a redstone signal from bundled redpower wire. When the timer reaches 4 minutes the seconds timer start counting down too (only then, that's what happened in the series so I designed it this way) and an iron note block peripheral emmits the "BEEP" noise. When the timer if below a minute, an industrial craft 2 howler alarm goes off by the redpower bundled cables.
NOTE: Remember to use 3 advanced monitors and an advanced computer.
Alter the code to your preferences. Sorry that I did not put comments on the code :(/> .
Here is a pic of the the timer:


And here's the code:

--Swan Station Timer
term.clear()
term.setCursorPos(1,1)
m = peripheral.wrap("front")
s = peripheral.wrap("top")
m.setTextScale(5)
minutes = 108
seconds = 0
print("Initializing Timer...")
m.clear()
m.setCursorPos(1,1)
m.setTextColor(1)
m.setBackgroundColor(32768)
m.write("108:")
m.setTextColor(32768)
m.setBackgroundColor(1)
m.write("00")
while(minutes >0 or seconds > 0) do

  if (redstone.getInput("right") and minutes < 4) then
	redstone.setBundledOutput("left", 0)
	  print("Reseting...")
	  minutes = 108
	  seconds = 0
print("Initializing timer...")
m.clear()
m.setCursorPos(1,1)
m.setTextColor(1)
m.setBackgroundColor(32768)
m.write("108:")
m.setTextColor(32768)
m.setBackgroundColor(1)
m.write("00")
	  os.sleep(1)
  end

  m.setCursorPos(1,1)
  temp = seconds
  temp2 = minutes
  if (minutes == 0 and seconds == 0 ) then
  seconds = 0
  temp = seconds
  end
if(minutes <= 4) then
if (minutes <= 4 and minutes >=1) then
  s.playNote(0,18)
end
  if (minutes < 1) then
	redstone.setBundledOutput("left", 1)
  end
seconds = seconds - 1
temp = seconds
  if(seconds < 0) then
	seconds = 59
	temp = seconds
	minutes = minutes - 1
	temp2 = minutes
	seconds = tostring(seconds)
  elseif(seconds < 10 and seconds >= 0) then
	 seconds = "0"..tostring(seconds)
  end
  os.startTimer(1)
  os.pullEvent("timer")
else
os.startTimer(60)
os.pullEvent("timer")
minutes = minutes - 1
temp2 = minutes
seconds = "0"..tostring(seconds)
end
  if (minutes < 10 and minutes >= 0) then
	minutes = "00"..tostring(minutes)

  elseif (minutes < 100) then
	minutes = "0"..tostring(minutes)
  end
m.setTextColor(1)
m.setBackgroundColor(32768)
m.write(minutes..":")
m.setTextColor(32768)
m.setBackgroundColor(1)
m.write(seconds)
seconds = tonumber(temp)
minutes = tonumber(temp2)

end
m.clear()
m.setCursorPos(1,1)
m.setTextColor(1)
m.setBackgroundColor(32768)
m.write("000:")
m.setTextColor(32768)
m.setBackgroundColor(1)
m.write("00")
os.sleep(0.5)
m.clear()
m.setBackgroundColor(32768)
m.setTextColor(16384)
m.setCursorPos(1,1)
m.write("l@!:")
m.setBackgroundColor(16384)
m.setTextColor(32768)
m.write("&amp;\\ ")
print("SYSTEM FAILTURE")
os.startTimer(5)
os.pullEvent("timer")
redstone.setBundledOutput("left", 2)
while true do
  if (redstone.getInput("right")) then
	  os.sleep(1)
	  os.reboot()
  end
os.pullEvent("redstone")
end