 Readme for PRESTO Tester
~~~~~~~~~~~~~~~~~~~~~~~~~~

Before running application, Presto USB drivers must be installed and PRESTO
connected.


Typical testing without any voltage on VDD requires to switch VDD from PRESTO
on (in VDD&AUX options box) to allow power supply for output drivers.

There are three different voltage levels on VDD: "<2V", ">2V" and "5V".

VPP 13V can be applied to P pin without any voltage on VDD. With 13V on, pin P 
reads unpredictable value.

Pins D and I have very weak pull-downs so they should be readed as log.0 when 
output is tristated.

Pin reads are refreshed about twice per second.
