View source for G7273 grant continuity card

[[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.

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.

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: UNIBUS]]