AN A319 ON LNDG ROLL AT ORD LOST SOME CRITICAL COMPONENTS INCLUDING ELECTRICAL BUSSES; ENGINE REVERSER; AND NOSEWHEEL STEERING; RESULTING IN LOSS OF CTL FOR SEVERAL SECONDS BEFORE THE BACKUP SYSTEMS ENGAGED.

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CAPTAIN FLYING. NORMAL TOUCHDOWN. CAPTAIN APPLIED FULL THRUST REVERSE; SPOILERS DEPLOYED AND HE STARTED BRAKING SHORTLY AFTER TOUCHDOWN. EVERYTHING YOU WOULD NORMALLY DO TO PLAN A TAXIWAY C TURNOFF ON A WET RWY. AT ABOUT 100 KTS MY PFD AND ND WENT BLACK AND I GLANCED IN THE COCKPIT FOR A SPLIT SECOND TO ASSESS THE SITUATION. UPON LOOKING OUTSIDE AGAIN I SAW US HEADING FOR THE DIRT PRIOR TO C. WITH NO TIME TO CHAT I PUSHED ON THE RIGHT RUDDER AND APPLIED SOME RIGHT BRAKE. AT LEAST I MADE THE INPUT; WHETHER OR NOT THE AIRCRAFT RESPONDED IS AT QUESTION. AFTER SOME FISHTAILING; THE CAPTAIN REGAINED CONTROL AND WE EXITED RWY AT C WITHOUT INCIDENT. ECAM FOR THRUST REVERSER 1 AND GEN 1. WHY WE VEERED TO THE LEFT AND NOT THE RIGHT IS UNKNOWN. THE CAPTAIN TALKED TO MAINT. IT APPEARS THAT THE FOLLOWING HAPPENED: AC-1; DC-1 FAILURE FOLLOWED BY A FAILURE OF THE TIE-BUS; BSCU-1 FAILURE CAUSING ANTI-SKID AND NOSEWHEEL STEERING FAILURE UNTIL BSCU-2 PICKS UP; IF IT EVER DID WHICH HE CAN'T TELL; REVERSER 1 FAILURE DMC-2 FAILURE (MY INSTRUMENTS). ONE OF THE LGCIU'S ALSO FAILED. MY UNDERSTANDING IS THERE WERE OVER 10 FAILURE CODES. WE HAD NO CONTROL! EVEN WORSE THE AIRCRAFT HAD TO HAVE MADE SOME UNCOMMANDED INPUTS. LOSING THE #1 THRUST REVERSER THEN VEERING LEFT IS NOT THE EXPECTED RESULT. THIS WHOLE THING IS VERY SCARY. A 2 SECOND LOSS OF CONTROL AT 50 FEET WOULD HAVE RESULTED IN A SMOKING HOLE.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: NO ADDITIONAL INFORMATION AT THIS TIME.