There are 3 types of smartcables:

Making your own smartcable

You can even make your own serial smartcable that works with the ZDSII IDE. If your computer does not have a serial port you can use an usb to ttl serial converter as well.

Using a level shifter

Using an usb to ttl serial converter

You might have to change the com port number the usb to serial converter uses to a port in the range of 1-10, because ZDS cannot access anything above COM10

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