View source for CTI BUS

The '''CTI BUS''' (Computing Terminal Interconnect Bus) was developed for and used on the [[Professional 300 Series]] of [[Digital Equipment Corporation|DEC]] [[PDP-11]] personal computers solely. It seems to be a variant form of a [[QBUS]], with some additional [[signal]]s, carried on a [[connector]] with a different physical form factor (a 90-pin zero-insertion-force connector, of which the first 60 pins are used for the CTI BUS).

In most cases, the bus will allow option modules to be placed in any available option slot. Each option module can generate two different hardware interrupt signals. When an option is in place, an option-present signal is asserted. Each option contains onboard ROM with identification information.

== CTI BUS Interfaces ==

* [[DECNA]] - CTI Ethernet Network Adapter
* [[DLC11]] - CTI Serial Interface 
* [[DRC11]] - CTI Parallel Interface
* [[DTC11]] - CTI Telephone Management System Interface

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==External links==

* [http://bitsavers.org/pdf/dec/pdp11/pro3xx/EK-PC350-TM-001_Professional_300_Series_Technical_Manual_Dec82.pdf Professional 300 Series Technical Manual] (EK-PC350-TM-001) - see Sections 5.3.3, "Buses", and 7.2.1.1, "CTI BUS Interface Circuits"

[[Category: QBUS]]
[[Category: DEC Buses]]