The IBM 2365 Processor Storage is a magnetic-core memory storage unit that is a component of the IBM System/360 models 65,[1] 67,[2] 75[3] and 85[4] computers, which were released between 1965 and 1968.
Storage is implemented using magnetic cores with a storage width of 72 bits, which comprise 64 data bits (8 bytes, or one doubleword) plus 8 parity bits.
This improves performance when doing sequential access.
Because the System/360 model 85 CPU is so much faster than memory, if there are two IBM 2365 model 5 components they are two-way interleaved, and if there are four IBM 2365 model 5 components they are four-way interleaved.
Because the IBM 2365 model 5 is internally two-way interleaved, sequential 128-bit memory operations issued by the System/360 model 85 CPU traverse all the memory components before cycling back to the first.