DIA20 IBus Adapter - Revision history

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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.)

==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 [[DEC card form factor|hex]] boards (two M8550s and an M8551) plugged into an I/O [[backplane]] (one shared with the [[DMA20 Memory Bus Controller‏‎]]) of the KL10; these are connected to new-style I/O bus connectors mounted lower down in that rack.

==External links==

* [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-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]]

← Older revision		Revision as of 10:34, 6 November 2023
Line 1:		Line 1:
−	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.) Later KL10s did not normally include the backplane into which the DIA20 plugged; a backplane ~~and~~ a DIA20 ~~was~~ denominated a '''DIB20'''.	+	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.) Later KL10s did not normally include the backplane into which the DIA20 plugged; that backplane together with a DIA20 were denominated a '''DIB20'''.

	==Implementation==		==Implementation==

← Older revision		Revision as of 19:54, 5 November 2023
Line 1:		Line 1:
−	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.)	+	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.) Later KL10s did not normally include the backplane into which the DIA20 plugged; a backplane and a DIA20 was denominated a '''DIB20'''.

	==Implementation==		==Implementation==

← Older revision		Revision as of 21:13, 27 September 2022
Line 1:		Line 1:
−	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.)	+	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==

@@ Line 12: / Line 12: @@
 * [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-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]]

@@ Line 2: / Line 2: @@
 ==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 [[DEC card form factor|hex]] boards (two M8550s and an M8551) plugged into an I/O [[backplane]] (one shared with the [[DMA20 Memory Bus Controller‏‎]]) of the KL10; these are connected to new-style I/O bus connectors mounted lower down in that rack.
+It consists of a number of [[DEC card form factor|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==