OK, I got xtrace to work ("$ x11trace -n -D 192.168.1.1:10.0" & have the
instrument connect to display 10.0) and it was more instructive...
Got connection from 192.168.1.16:6144
000:<: am msb-first want 11:0 authorising with '' of length 0
000:>: Failed, version is 11:0 reason is ' Prohibited client endianess, see
the Xserver man page '.
So as per the man page I added +byteswappedclients to the Xorg command line and
it works!
The HP instrument runs a Motorola MC68020 (big endian) & my RPI ARM is set up
as little endian. Back in the day I think most machines were big endian (before
*nix on Intel processors became a thing)
Thanks Carsten & Grant for the clues and debugging advice 8-)
Michael
