G7273 grant continuity card - Revision history

Jnc: /* See also */ M8264 No-SACK Timeout Module

2022-12-04T14:30:46Z

‎See also: M8264 No-SACK Timeout Module

Jnc: +cat

2022-10-24T19:45:48Z

+cat

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2021-12-03T15:48:37Z

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Jnc: have article now

2021-12-03T10:57:39Z

have article now

Jnc: +cat

2018-12-16T23:25:49Z

+cat

Jnc: Link connectors

2017-12-17T00:07:28Z

Link connectors

Jnc: Pretty complete...

2017-07-25T14:19:09Z

Pretty complete...

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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.

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.

@@ Line 8: / Line 8: @@
 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]]
 [[Category: UNIBUS]]

← Older revision		Revision as of 19:45, 24 October 2022
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	[[Category: DEC Boards]]		[[Category: DEC Boards]]
		+	[[Category: UNIBUS]]

← Older revision		Revision as of 15:48, 3 December 2021
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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.

@@ Line 1: / Line 1: @@
 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.

← Older revision		Revision as of 23:25, 16 December 2018
Line 6:		Line 6:

	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]]

← Older revision		Revision as of 00:07, 17 December 2017
Line 1:		Line 1:
−	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.