IBM System/370 Model 168
Two options were available for the IBM System/370 model 168 for attaching a second processor. One was the IBM 3062 Attached Processing Unit, in which the second processor had no access to the channels, and was therefore similar to the B5000's Processor B or the second processor on a VAX-11/782. The other option offered a complete second CPU, and was thus more like the System/360 model 65MP.
Read more about this topic: Asymmetric Multiprocessing
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