Program changing in data processing

Claim 1

IN AN ELECTRONIC DATA PROCESSING APPARATUS HAVING A ROTATABLE MAGNETIC DRUM TO STORE INFORMATION IN A PLURALITY OF SLOTS ANGULARLY SPACED AROUND SAID DRUM, EACH OF SAID SLOTS HAVING A DIFFERENT ADDRESS, INPUT MEANS TO RECEIVE DATA TO BE PROCESSED, AND MEANS TO PERFORM LOGICAL OPERATIONS ON THE DATA RECEIVED BY SAID INPUT MEANS IN ACCORDANCE WITH THE INFORMATION STORED ON SAID MAGNETIC DRUM, MEANS TO RECORD INFORMATION ON SAID MAGNETIC DRUM IN THE SLOTS PASSING IN RECORDING RELATIONSHIP THEREWITH, COUNTING MEANS TO COUNT THE SLOTS AS THEY PASS IN RECORDING RELATIONSHIP WITH SAID RECORDING MEANS, BUFFER STORAGE MEANS TO STORE DATA REPRESENTING INFORMATION TO BE RECORDED IN THE SLOT AND THE ADDRESS OF THE SLOT IN WHICH THE INFORMATION IS TO BE RECORDED, A NORMALLY DISABLED GATE CONNECTED TO FEED TO SAID RECORDING MEANS THE INFORMATION TO BE RECORDED WHICH IS STORED IN SAID BUFFER STORAGE MEANS, MEANS TO ENABLE SAID GATE WHEN THE COUNT REGISTERED BY SAID COUNTING MEANS COINCIDES WITH THE ADDRESS STORED IN SAID BUFFER STORAGE MEANS AND GATING MEANS COUPLED BETWEEN SAID BUFFER STORAGE AND SAID INPUT MEANS RESPONSIVE TO A SPECIAL SIGNAL RECEIVED BY SAID INPUT MEANS TO FEED TO SAID BUFFER STORAGE MEANS DATA RECEIVED BY SAID INPUT MEANS REPRESENTING INFORMATION TO BE STORED ON SAID MAGNETIC DRUM AND AN ADDRESS ON SAID MAGNETIC DRUM.