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that ran on these machines were OS/360 M65MP and TSS/360. Other software developed at universities, notably the Michigan Terminal System (MTS), used both CPUs. Both processors could access data channels and initiate I/O. In OS/360 M65MP, peripherals could generally be attached to either processor since the operating system kernel ran on both processors (though with a "big lock" around the I/O handler). The MTS supervisor (UMMPS)

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