I have a 555 as well! Still looking for a damn
power umbilical.. :-/
I guess the main problem to making one is finding the connectors. They're
actually larger versions of the well-known microribbon series, which is I
guess why the HPIB, Centronics, etc connectors re called _micro_ribbon.
Fortunately my 'scope came with the PSU - 'indicator' cable, but I don't
have a spare one.
-tony