Read and write drive system for a 21/2D coincident current magnetic core memory

In a 21/2D magnetic core memory for storing n-bit words, a plurality, N, of groups of bit lines, being provided for each word bit, each group having the same number, M, of bit lines, each bit line being threaded through a plurality of cores, each core storing a bit of a different word, for an n-bit word there being provided a total of n.N groups of bit lines, each bit in a word being stored in a correspondingly placed core in a different one of said N groups of bit lines, a switching system for said memory comprising:

• a separate write drive switch means for each group of bit lines in all of said n.N groups,
• means connecting each one of said write drive switch means to one of the ends of a different one of the groups of bit lines,
• a plurality of write sink switch means, the number in said plurality equalling the number, N, of groups of bit lines,
• means connecting each one of said write sink switch means to the other ends of different but correspondingly located bit lines in all of said n.N groups of bit lines,
• a plurality of read drive switch means, the number in said plurality equalling the number, N, of groups of bit lines,
• means connecting each one of said read drive switch means to said other ends of different but correspondingly located bit lines in all of said n.N groups of bit lines,
• a plurality of read sink switch means, the number of read sink switch means in said plurality equalling the number N of groups of bit lines, and
• means coupling each read sink switch means to said one ends of a different but correspondingly located group of bit lines in all of said n.N groups of bit lines.