The System / 360 block multiplexor channel which could operate as a selector channel to allow attachment of legacy subsystems.
2.
These adapters could be connected to any of the three System / 370 channel types but a block multiplexor channel was preferred.
3.
The IBM 2305 fixed head storage ( a fixed-head disk drive sometimes incorrectly called a drum ) and associated IBM 2835 Storage Control were announced in 1970, initially to connect to the 360 / 85 and 360 / 195 using the IBM 2880 Block Multiplexor Channel.
4.
Later, for larger IBM System / 360 computers, and even for early System / 370 models, the selector channels and the multiplexor channels still were bulky and expensive separate processors, such as the IBM 2860 Selector channel ( one to three selector channels in a single box ), the IBM 2870 Byte multiplexor channel ( one multiplexer channel, and, optionally, one selector subchannel in a single box ) and the IBM 2880 Block multiplexor channel ( one or two block multiplexor channels in a single box ).
5.
Later, for larger IBM System / 360 computers, and even for early System / 370 models, the selector channels and the multiplexor channels still were bulky and expensive separate processors, such as the IBM 2860 Selector channel ( one to three selector channels in a single box ), the IBM 2870 Byte multiplexor channel ( one multiplexer channel, and, optionally, one selector subchannel in a single box ) and the IBM 2880 Block multiplexor channel ( one or two block multiplexor channels in a single box ).
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