G7273 grant continuity card - Revision history

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	[[Category: DEC Boards]]		[[Category: DEC Boards]]
			[[Category: UNIBUS]]

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			[[Image:G7273Front.jpg\|300px\|thumb\|right\|G7273 card; front side, showing NPG jumper in upper right corner]]

	The '''G7273 grant continuity card''' was [[DEC card form factor\|dual]] width card which plugged into the [[DEC edge connector contact identification\|C and D connectors]] of an [[Small Peripheral Controller\|SPC slot]] or [[Modified UNIBUS Device\|MUD slot]] in a [[UNIBUS]] [[backplane]], in an otherwise-empty slot, and carried the [[bus grant line]] signals from the 'in' pins to the 'out' pins in the slot.		The '''G7273 grant continuity card''' was [[DEC card form factor\|dual]] width card which plugged into the [[DEC edge connector contact identification\|C and D connectors]] of an [[Small Peripheral Controller\|SPC slot]] or [[Modified UNIBUS Device\|MUD slot]] in a [[UNIBUS]] [[backplane]], in an otherwise-empty slot, and carried the [[bus grant line]] signals from the 'in' pins to the 'out' pins in the slot.

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	The '''G7273 grant continuity card''' was [[DEC card form factor\|dual]] width card which plugged into the [[DEC edge connector contact identification\|C and D connectors]] of an [[Small Peripheral Controller\|SPC slot]] or [[Modified UNIBUS Device\|MUD slot]] in a [[UNIBUS]] [[backplane]], in an otherwise-empty slot, and carried the [[bus grant line]] signals from the 'in' pins to the 'out' pins in the slot.		The '''G7273 grant continuity card''' was [[DEC card form factor\|dual]] width card which plugged into the [[DEC edge connector contact identification\|C and D connectors]] of an [[Small Peripheral Controller\|SPC slot]] or [[Modified UNIBUS Device\|MUD slot]] in a [[UNIBUS]] [[backplane]], in an otherwise-empty slot, and carried the [[bus grant line]] signals from the 'in' pins to the 'out' pins in the slot.

	Unlike the earlier [[G727 grant continuity card]], it carried not only the BG4-BG7 [[interrupt]] grant lines, but it also carried the ~~NPG~~ [[~~Direct Memory Access~~\|~~DMA~~]] ~~grant line~~.		Unlike the earlier [[G727 grant continuity card]], it carried not only the BG4-BG7 [[interrupt]] grant lines, but it also carried the [[Non-Processor Request and Grant\|NPG grant line]].

	In all SPC and MUD backplanes, there was normally a [[wire-wrap]] jumper on the rear of the backplane for the NPG line, which had to be removed before a DMA device could be plugged into that slot. The G7273 allowed such a device to be removed, without the necessity of replacing the jumper.		In all SPC and MUD backplanes, there was normally a [[wire-wrap]] jumper on the rear of the backplane for the NPG line, which had to be removed before a DMA device could be plugged into that slot. The G7273 allowed such a device to be removed, without the necessity of replacing the jumper.

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	Later PDP-11's, such as the [[PDP-11/84]], made extensive use of the G7273, instead of the G727, so that there was no need to have, or remove, those jumpers.		Later PDP-11's, such as the [[PDP-11/84]], made extensive use of the G7273, instead of the G727, so that there was no need to have, or remove, those jumpers.

			[[Category: DEC Boards]]

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2017-12-17T00:07:28Z

Link connectors

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	The '''G7273 grant continuity card''' was [[DEC card form factor\|dual]] width card which plugged into an [[Small Peripheral Controller\|SPC slot]] or [[Modified UNIBUS Device\|MUD slot]] in a [[UNIBUS]] [[backplane]], in an otherwise-empty slot, and carried the [[bus grant line]] signals from the 'in' pins to the 'out' pins in the slot.		The '''G7273 grant continuity card''' was [[DEC card form factor\|dual]] width card which plugged into the [[DEC edge connector contact identification\|C and D connectors]] of an [[Small Peripheral Controller\|SPC slot]] or [[Modified UNIBUS Device\|MUD slot]] in a [[UNIBUS]] [[backplane]], in an otherwise-empty slot, and carried the [[bus grant line]] signals from the 'in' pins to the 'out' pins in the slot.

	Unlike the earlier [[G727 grant continuity card]], it carried not only the BG4-BG7 [[interrupt]] grant lines, but it also carried the NPG [[Direct Memory Access\|DMA]] grant line.		Unlike the earlier [[G727 grant continuity card]], it carried not only the BG4-BG7 [[interrupt]] grant lines, but it also carried the NPG [[Direct Memory Access\|DMA]] grant line.

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New page

The '''G7273 grant continuity card''' was [[DEC card form factor|dual]] width card which plugged into an [[Small Peripheral Controller|SPC slot]] or [[Modified UNIBUS Device|MUD slot]] in a [[UNIBUS]] [[backplane]], in an otherwise-empty slot, and carried the [[bus grant line]] signals from the 'in' pins to the 'out' pins in the slot.

Unlike the earlier [[G727 grant continuity card]], it carried not only the BG4-BG7 [[interrupt]] grant lines, but it also carried the NPG [[Direct Memory Access|DMA]] grant line.

In all SPC and MUD backplanes, there was normally a [[wire-wrap]] jumper on the rear of the backplane for the NPG line, which had to be removed before a DMA device could be plugged into that slot. The G7273 allowed such a device to be removed, without the necessity of replacing the jumper.

Later PDP-11's, such as the [[PDP-11/84]], made extensive use of the G7273, instead of the G727, so that there was no need to have, or remove, those jumpers.

← Older revision		Revision as of 14:30, 4 December 2022
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	Later PDP-11's, such as the [[PDP-11/84]], made extensive use of the G7273, instead of the G727, so that there was no need to have, or remove, those jumpers.		Later PDP-11's, such as the [[PDP-11/84]], made extensive use of the G7273, instead of the G727, so that there was no need to have, or remove, those jumpers.

			==See also==

			* [[M8264 No-SACK Timeout Module]] - in particular, the [[M8264 No-SACK Timeout Module#Functionality discussion\|Discussion]] section

	[[Category: DEC Boards]]		[[Category: DEC Boards]]
	[[Category: UNIBUS]]		[[Category: UNIBUS]]