The Cambridge Z88 has a (normal, 9-pin) serial port thus communication
with it should be easy. It is not. It is quite easy to use its
Import/Export functionality against a good terminal program like the
Minicom. In such case one is limited to plain text files (no
formatting, no PipeDream files and so on).
A DOS program named Z88.COM which should be able to cooperate with the
Import/Export. It does not work in the DOSBox, though.
An Eazylink software for the Z88 exists and it is widely recommended.
A Qt5-based Eazylink2 program for desktop exist. It compiles on the
ppc64le Linux but it does not start...
Thus I have decided to try the old DOS LINK.EXE. It does work in the
DOSBox. It is not the easiest software to use (almost useless without
the manual). But it does its work: I backed up my RAM and uploaded
PipeDream file which I created on the desktop. And it was fast.