Connecting to a modern Xserver with an old client

[Michael K]

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