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The UNICHANNEL 15 System (UC15) is an group of hardware sub-systems which allows a PDP-15 to communicate with a PDP-11 (usually a PDP-11/05) which acts as an I/O front end, partially to offload the PDP-15's CPU, but also to allow PDP-15 systems access to devices which did not have native PDP-15 support, such as the RK05 disk drive. The UC15 includes two separate sub-systems:

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