Current steering circuit

Claim 1

IN A MULTI-WORD LINEAR SELECTION MAGNETIC CORE MEMORY SYSTEM, INCLUDING A PLURALITY OF PLANES FORMING A THREE DIMENSIONAL MATRIX WITH EACH PLANE HAVING A PLURALITY OF MAGNETIZABLE CORES THEREON AND STACKED VERTICALLY SUCH THAT THE CORES LYING ALONG A VERTICAL LINE REPRESENT BITS OF A WORD, A READ-WRITE DRIVE CIRCUIT COMPRISING A FIRST ELECTRICAL CURRENT CONDUCTING MEANS THREADING A GROUP OF CORES, WHICH CORE EACH LIE IN A DIFFERENT ONE OF SAID PLANES AND TOGETHER REPRESENTS A WORD, SAID CURRENT CONDUCTING MEANS BYPASSING THE REMAINING CORES OTHER THAN THOSE CONSTITUTING A DESIRED WORD, A REFERENCE VOLTAGE SOURCE COUPLED TO A FIRST END OF SAID CURRENT CONDUCTING MEANS, A FIRST UNIDIRECTIONAL CURRENT CONDUCTING DEVICE HAVING FIRST AND SECOND TERMINALS AND HAVING ITS FIRST TERMINAL COUPLED TO A SECOND END OF SAID ELECTRICAL CURRENT CONDUCTING MEANS TO PROVIDE A FIRST DIRECTION CURRENT CONDUCTING PATH, A SECOND UNIDIRECTIONAL CURRENT CONDUCTING DEVICE HAVING FIRST AND SECOND TERMINALS AND HAVING ITS SECOND TERMINAL COUPLED TO SAID SECOND END OF SAID ELECTRICAL CURRENT CONDUCTING MEANS TO PROVIDE A SECOND DIRECTION CURRENT CONDUCTING PATH, FIRST AND SECOND SEMICONDUCTOR VARIABLE CURRENT GENERATING MEANS RESPECTIVELY COUPLED TO SAID SECOND TERMINAL OF SAID FIRST UNIDIRECTIONAL CURRENT CONDUCTING DEVICE AND TO SAID FIRST TERMINAL OF SAID SECOND UNIDIRECTIONAL CURRENT CONDUCTING DEVICE TO PROVIDE CURRENT FLOW ALTERNATIVELY ALONG SAID FIRST AND SECOND DIRECTION CURRENT CONDUCTING PATHS THROUGH SAID MAGNETIZABLE CORES OF ONLY THOSE CORES CONSITUTING A DESIRED WORD TO PROVIDE FLUX INTERLINKING SAID CORES IN A FIRST AND SECOND DIRECTION, CIRCUIT MEANS CAUSING SAID FIRST SEMICONDUCTOR VARIABLE CURRENT GENERATING MEANS TO PROVIDE CURRENT FLOW OF SUFFICIENT MAGNITUDE, IN THE ABSENCE OF ADDITIONAL AIDING CURRENT, TO READ OUT SAID GROUP OF CORES BY SWITCHING THE SWITCHABLE ONES OF SAID CORES INTO THEIR OPPOSITE MAGNETIZABLE STATE AND CIRCUIT MEANS CAUSING SAID SECOND SEMICONDUCTOR CURRENT GENERATOR MEANS TO PROVIDE CURRENT FLOW FOR WRITING DESIRED BITS INTO SAID GROUP OF CORES ONLY WHEN FLOWING IN THE PRESENCE OF AN INFORMATION CURRENT SEPARATELY PROVIDED BY A FURTHER ELECTRICAL CURRENT CONDUCTING MEANS COUPLED TO THE INDIVIDUAL BIT CORES, A SEPARATE SENSING MEANS FOR EACH SAID PLANE AND DURING A READ OUT OPERATION CONNECTED TO RECEIVE OUTPUT SIGNALS FROM ONLY THOSE CORES OF SAID DESIRED WORD, SAID SECOND CURRENT GENERATOR MEANS PROVIDING SUBSTANTIALLY TWO-THIRDS THE CURRENT REQUIRED TO SWITCH THE WORD CORES DURING A WRITING OPERATION AND SAID FURTHER ELECTRICAL CONDUCTING MEANS BEING CAPABLE OF GENERATING SUBSTANTIALLY ONE-THIRD THE CURRENT REQUIRED TO SWITCH THE BIT CORES AND BEING OF A POSITIVE OR A NEGATIVE POLARITY DEPENDING UPON THE BINARY BIT TO BE STORED IN EACH CORE OF SAID WORD.