KT24 UNIBUS map option - Revision history

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‎External links: +manual, typo

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‎UNIBUS map: control jumpers

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New page

The '''KT24 UNIBUS map option''' is an option for the [[PDP-11/24]] which provided a full path between its [[UNIBUS]] and [[Extended UNIBUS]] (EUB) via a [[UNIBUS map]]. It also provided a number of other facilities, including [[chip socket]]s for a [[bootstrap]] [[PROM]] set (compatible with those of the [[M9312 ROM|M9312]]), and a [[power supply]] [[voltage]] monitor for the system. The KT24 was implemented as a single [[DEC card form factor|hex]] [[printed circuit board]], the '''M7134'''.

==UNIBUS map==

The KT24 had standard UNIBUS map functionality; a set of 31 mapping [[register]] pairs in the KT24 mapped 8 Kbyte blocks of UNIBUS [[address space]] to any location within the 4 Mbyte [[main memory]] address space.

If no KT24 was present, the [[Central Processing Unit|CPU]] detected its absence, and turned on a set of drivers on the CPU card which gated the [[address]] from the UNIBUS through to the EUB. (Pin FE1 of the CPU slot, "UB to MA VIA UBMAP", is connected to a pull-up on the CPU board, and also runs to the slot where the KT24 is plugged in, where it is grounded if a KT24 is plugged in; that signal is used to generate "UB to MA", which is the cross-connection enable signal.)

[[Category: UNIBUS PDP-11s]]

← Older revision		Revision as of 14:02, 6 February 2024
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	[[Category: UNIBUS PDP-11s]]		[[Category: UNIBUS PDP-11s]]
		+	[[Category: Extended UNIBUS]]

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 ==External links==
-* [http://www.bitsavers.org/pdf/dec/pdp11/1124/MP01029_KT24_UNIBUS_MAP_SCHEMATICS.pdf KT24 Unibus Map Option Field Maintenance Print Set (MP01029)
+* [http://www.bitsavers.org/pdf/dec/pdp11/1124/EK-11024-TM-001_PDP11_24_System_Technical_Manual_Jun81.pdf PDP-11/24 System Technical Manual] - the KT24 is covered in Chapter 6 (pp. 162-174)
 [[Category: UNIBUS PDP-11s]]

← Older revision		Revision as of 21:58, 14 January 2022
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	If no KT24 was present, the [[Central Processing Unit\|CPU]] detected its absence, and turned on a set of drivers on the CPU card which gated the [[address]] from the UNIBUS through to the EUB. (Pin FE1 of the CPU slot, "UB to MA VIA UBMAP", is connected to a pull-up on the CPU board, and also runs to the slot where the KT24 is plugged in, where it is grounded if a KT24 is plugged in; that signal is used to generate "UB to MA", which is the cross-connection enable signal.)		If no KT24 was present, the [[Central Processing Unit\|CPU]] detected its absence, and turned on a set of drivers on the CPU card which gated the [[address]] from the UNIBUS through to the EUB. (Pin FE1 of the CPU slot, "UB to MA VIA UBMAP", is connected to a pull-up on the CPU board, and also runs to the slot where the KT24 is plugged in, where it is grounded if a KT24 is plugged in; that signal is used to generate "UB to MA", which is the cross-connection enable signal.)
		+
		+	==External links==
		+
		+	* [http://www.bitsavers.org/pdf/dec/pdp11/1124/MP01029_KT24_UNIBUS_MAP_SCHEMATICS.pdf KT24 Unibus Map Option Field Maintenance Print Set (MP01029)

	[[Category: UNIBUS PDP-11s]]		[[Category: UNIBUS PDP-11s]]

@@ Line 5: / Line 5: @@
 ==UNIBUS map details==
-The KT24 had standard UNIBUS map functionality; a set of 31 mapping [[register]] pairs in the KT24 mapped 8 Kbyte blocks of UNIBUS [[address space]] to any location within the 4 Mbyte [[main memory]] address space. A pair of [[jumper]] sets could limit the range of UNIBUS address space which was mapped; a control bit in the KT24's Last Mapped Address register causes the jumpers to be ignored, for [[diagnostic]] purposes.
+The KT24 had standard UNIBUS map functionality; a set of 31 mapping [[register]] pairs in the KT24 mapped 8 Kbyte blocks of UNIBUS [[address space]] to any location within the 4 Mbyte [[main memory]] [[address space]]. A pair of [[jumper]] sets could limit the range of UNIBUS address space which was mapped; a control bit in the KT24's Last Mapped Address [[register]] causes the jumpers to be ignored, for [[diagnostic]] purposes.
 If no KT24 was present, the [[Central Processing Unit|CPU]] detected its absence, and turned on a set of drivers on the CPU card which gated the [[address]] from the UNIBUS through to the EUB. (Pin FE1 of the CPU slot, "UB to MA VIA UBMAP", is connected to a pull-up on the CPU board, and also runs to the slot where the KT24 is plugged in, where it is grounded if a KT24 is plugged in; that signal is used to generate "UB to MA", which is the cross-connection enable signal.)
 [[Category: UNIBUS PDP-11s]]

@@ Line 3: / Line 3: @@
 The '''KT24 UNIBUS map option''' is an option for the [[PDP-11/24]] which provided a full path between its [[UNIBUS]] and [[Extended UNIBUS]] (EUB) via a [[UNIBUS map]]. It also provided a number of other facilities, including [[chip socket]]s for a [[bootstrap]] [[PROM]] set (compatible with those of the [[M9312 ROM|M9312]]), and a [[power supply]] [[voltage]] monitor for the system. The KT24 was implemented as a single [[DEC card form factor|hex]] [[printed circuit board]], the '''M7134'''.
-==UNIBUS map==
+==UNIBUS map details==
 The KT24 had standard UNIBUS map functionality; a set of 31 mapping [[register]] pairs in the KT24 mapped 8 Kbyte blocks of UNIBUS [[address space]] to any location within the 4 Mbyte [[main memory]] address space. A pair of [[jumper]] sets could limit the range of UNIBUS address space which was mapped; a control bit in the KT24's Last Mapped Address register causes the jumpers to be ignored, for [[diagnostic]] purposes.

← Older revision		Revision as of 00:30, 25 January 2020
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		+	[[Image:KT24.jpg\|300px\|thumb\|right\|KT24 board]]
		+
	The '''KT24 UNIBUS map option''' is an option for the [[PDP-11/24]] which provided a full path between its [[UNIBUS]] and [[Extended UNIBUS]] (EUB) via a [[UNIBUS map]]. It also provided a number of other facilities, including [[chip socket]]s for a [[bootstrap]] [[PROM]] set (compatible with those of the [[M9312 ROM\|M9312]]), and a [[power supply]] [[voltage]] monitor for the system. The KT24 was implemented as a single [[DEC card form factor\|hex]] [[printed circuit board]], the '''M7134'''.		The '''KT24 UNIBUS map option''' is an option for the [[PDP-11/24]] which provided a full path between its [[UNIBUS]] and [[Extended UNIBUS]] (EUB) via a [[UNIBUS map]]. It also provided a number of other facilities, including [[chip socket]]s for a [[bootstrap]] [[PROM]] set (compatible with those of the [[M9312 ROM\|M9312]]), and a [[power supply]] [[voltage]] monitor for the system. The KT24 was implemented as a single [[DEC card form factor\|hex]] [[printed circuit board]], the '''M7134'''.