Catclock was riginally an X10 program by Tony Della Fera, Dave Mankins, Ed Moy, Deanna Hohn and Philip Schneider, crafted for entertainment, in the late 1980's. It was also ported to the Plan 9 operating system by Tom Duff.
You must have an Uxn assembler and emulator.
uxnasm src/catclock.tal bin/catclock.rom
If do not wish to assemble it yourself, you can download catclock.rom.