Please read through this entire file before attempting the procedure. It is quite simple and only requires that you enter some commands on the command line. If you make a mistake that you cannot fix, reflash the image and try again. It is very important to enter the commands exactly as written.

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To use the DGTPi images on a stand-alone Raspberry Pi, follow the following steps.

    If your Pi is connected to your home network (wifi or ethernet) you can use ssh from another computer on the network, by entering ssh pi@<ip address> into a command prompt on the pc. For example, if the ip address of your Pi is 192.168.1.25, you would enter

ssh pi@192.168.1.25

The first time connecting via ssh, it will ask you if you trust the computer you are connecting to. Just type yes to continue. Then enter the password for the pi account (picochess is the default password).

    If your Pi is not connected to your network, you will need to connect a monitor and usb keyboard to the RPi. In this case, when you boot the Pi, and you are using the Lite image, it will boot to the command line. Just log in using

username: pi
password: picochess

    If you have the Desktop image, wait until the Desktop loads (it logs in automatically), and open the Terminal (left-click once on the right-most icon at the top left corner).

You are now ready to make the changes.

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Enter the following commands exactly as shown:

sudo service picochess stop
sudo systemctl disable dgtpi
sudo systemctl disable dgtpistandby

Next, use the nano editor to edit picochess.ini to comment out the dgtpi = true line. To do this enter the following command:

sudo nano /opt/picochess/picochess.ini

You are now in the editor at the top of the picochess.ini file. Use the arrow keys on your keyboard to move around. Using the down arrow, move the cursor down until you find the line

dgtpi = true

It will be around line 43. Add a '#' in front of that line to comment it out. It will look like this when finished:

#dgtpi = true

Now, close the editor and save the changes by using the following key-commands (note: the first command is the letter o not the number zero):

CTRL-o
<enter>
CTRL-x

In other words, hold down the Ctrl key and press o, let go, press the Enter key once, then hold down the Ctrl key and press x.

At this point, you could reboot and start using the image on the stand-alone Pi, by entering the command:

sudo reboot

However, there are some lines in the config.txt file that slow down the RPi in order to communicate with the DGT clock when wired directly, as in the DGTPi. To disable these lines, we will use the nano editor once again:

sudo nano /boot/config.txt

Using the down arrow, move the cursor down until you locate the following lines:

core_freq=250
core_freq_min=250

As before, put a '#' in front of each line, so it looks like this:

#core_freq=250
#core_freq_min=250

If using the Desktop image, there are 2 more entries to comment out. Using the down arrow, move the cursor down to the [pi4] section and you will see two entries:

core_freq=500
core_freq_min=500

Let's comment them out as before so they look like:

#core_freq=500
#core_freq_min=500

Now save the changes and exit nano, just like before:

CTRL-o
<enter>
CTRL-x

You can now reboot and use picochess:

sudo reboot

That's it.