There is an excellent pdf copy of the late version MK14 manual on Martin Lukasek's website here
http://www.8bity.cz/files/MK14/mk14ManualV2_OCR.pdf
That is the version of the manual you need to work with if your MK14, whether early issue or late issue, has the 'new' OS, as it correctly describes the operation of the machine with the new OS.