Difference between revisions of "DIA20 IBus Adapter"

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The '''DIA20 IBus Adapter''' (sometimes called the '''DIA20 In/Out Bus Controller''') is an optional [[device controller|controller]] on [[KL10]] [[Central Processing Unit|CPUs]] which provides an old-style [[PDP-10#Busses|PDP-10 I/O bus]] (termed an 'IBus'), to allow existing [[PDP-10]] [[peripheral]]s to be used on one. Two separate IBuses are provided per CPU. (In a [[multi-processor]] system, each CPU has a separate DIA20, if configured to have one.)
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The '''DIA20 IBus Adapter''' (sometimes called the '''DIA20 In/Out Bus Controller''') is an optional [[device controller|controller]] on [[KL10]] [[Central Processing Unit|CPUs]] which provides an old-style [[PDP-10 I/O Bus]] (termed an 'IBus'), to allow existing [[PDP-10]] [[peripheral]]s to be used on one. Two separate IBuses are provided per CPU. (In a [[multi-processor]] system, each CPU has a separate DIA20, if configured to have one.)
  
 
==Implementation==
 
==Implementation==
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* [http://www.bitsavers.org/pdf/dec/pdp10/KL10/EK-DIA20-TM-002_Jul76.pdf DIA20 IBus Adapter Unit Description]
 
* [http://www.bitsavers.org/pdf/dec/pdp10/KL10/EK-DIA20-TM-002_Jul76.pdf DIA20 IBus Adapter Unit Description]
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* [http://bitsavers.org/pdf/dec/pdp10/KL10/MP00301_KL10PV_Jun80.pdf KL10-PV Field Maintenance Print Set] - Contains DIA20 on pp. 462-487
 
* [http://www.bitsavers.org/pdf/dec/pdp10/KL10/EK-108OU-PD-002_KL10-Based_Physical_Description_Mar77.pdf KL10-Based Physical Description] - contains images of DIA20 backplanes and wiring, pp. 3-7-3-11; board configuration, pp. 3-27,3-28  
 
* [http://www.bitsavers.org/pdf/dec/pdp10/KL10/EK-108OU-PD-002_KL10-Based_Physical_Description_Mar77.pdf KL10-Based Physical Description] - contains images of DIA20 backplanes and wiring, pp. 3-7-3-11; board configuration, pp. 3-27,3-28  
  
 
[[Category: PDP-10s]]
 
[[Category: PDP-10s]]

Revision as of 22:13, 27 September 2022

The DIA20 IBus Adapter (sometimes called the DIA20 In/Out Bus Controller) is an optional controller on KL10 CPUs which provides an old-style PDP-10 I/O Bus (termed an 'IBus'), to allow existing PDP-10 peripherals to be used on one. Two separate IBuses are provided per CPU. (In a multi-processor system, each CPU has a separate DIA20, if configured to have one.)

Implementation

The DIA20 is connected to the EBox of the KL10 via the EBus; when no other controller on the EBus responds to a command, the DIA20 will respond, and send the command out the IBus. Similarly, interrupt requests from IBus devices are sent through to the EBox.

It consists of a number of hex boards (two M8550s and an M8551) plugged into an I/O backplane (one shared with the DMA20 Memory Bus Adapter‏‎) of the KL10; these are connected to new-style I/O bus connectors mounted lower down in that rack.

External links