Printing on PT-P950NW not possible

[ski7777]

I tried printing on my PT-P950NW but I only get empty and quite short pages. The cuts are as expected.

[ski7777]

Comparing the technical documents for PT-E550W/P750W/P710BT and PT-P900/P900W/P950NW/P910BT
I found an interesting difference on page 20 (both documents):
While the 700 series has 128 pins on the print head, the 900 series has 560. Therefore I think we need to adjust the code in the encode_line function.