Thanks to Dave "Pepsikid" Klein, here is a very comprehensive manual to build your own Timing Tree. He carefully documented his own building process with pictures and text, so you can all enjoy this extra SRM functionality!

Click here to download the Powerpoint Presentation file.

Most people use SRM to store fastest laps and ofcourse SRM does that in a great way: not only for you and your friends, but also for your cars.

What a lot of you might not know is that SRM can also store fastest times for a preset amount of laps!

Let's assume you often race 15 lap heats and you want to keep record of the fastest total times achieved. To do so, do this:

- Go to the Track screen, you will see your current track.
- Go to Notes with F7.
- Somewhere in the Notes field you must enter (RACE15). Do it with the brackets, just like it's displayed here.

From now on, if you race 15 lap heats, SRM will also ask you to store the times for the total heat.

Often I get the question if SRM supports external call buttons. Well ofcourse it does! :-)

SRM supports call buttons, external and internal. You can use the spacebar as a call button, but you can also connect external call buttons.
 
The external call buttons can be any "short circuit" button (like a doorbell button or a button of an old joystick). Connect this button to a GROUND pin and one of the DATA IN pins (10, 11, 12, 13 or 15) of the parallel port using a 200k resistor in line to prevent a short circuit.
 
So in other words:
 
GROUND PIN --- BUTTON --- 200ohm RESISTOR --- PIN 10/11/12/13/15
 
Installing SRM on a computer is not that difficult, but you will need a TRUE MS-DOS machine. If you have a Windows machine, you can achieve this by creating a small second partition on which you can install MS-DOS and SRM. Install a boot selector that will allow you to choose what you want to boot: Windows or MS-DOS.
 
if you have any more questions, feel free to e-mail me!