I also lack the cable for any other SLUs...so I'm
a bit screwed there.
What I've done lately is use a cable with a 10-pin header on one end
and a DE-9 on the other. These cables came from some inexpensive PC
rear brackets. I did have to cut a few of the lines and reconnect.
I'm using one for the console and another running to a 6809 SBC I'm
using as a TU-58 emulator. The latter one is wired so that I can use
the bit clock from the SBC to get a bit more speed out of it. So far,
I've been pretty happy with this approach.
BLS