The main reason was that the security chip, wich was a extended I2C eeprom (24RF02) reacted differently to commands as its non-security counterpart.
Where the men are men.
The women are men.
And the 13 year old girls are cops.
Who are alo men...
The electrical connection between the the JackPC and its shell is terrible! Some are so weak, that you only have to bump into the table and they lose connection.
It's so bad we considered soldering a short cat5 pigtail directly to the damn things and fix everything with hot glue...
They are still researching a material for the strap to fit US waist demands!
Pen and paper for diagrams.
Notebook/netbook for plain text.
Convert your hand-drawn diagrams later, using a scanner or re-draw using a graphics tablet after class.
I did exactly that "back in my day" using a Jornada 680. It worked great.