View source for KG11-A Exclusive-OR and CRC Block Check Option

The '''KG11-A Exclusive-OR and CRC Block Check Option''' is a [[UNIBUS]] [[co-processor]] which can calculate a number of different [[cyclic redundancy check|CRCs]] for use in [[data communication]] links. Data is transferred to and from the KG11 using [[programmed I/O]].

The CRC computations it supports are:

* LRC-8 = X<sup>8</sup> + 1 
* LRC-16 = X<sup>16</sup> + 1 
* CRC-16 = X<sup>16</sup> + X<sup>15</sup> + X<sup>2</sup> + 1 
* CRC-12 = X<sup>12</sup> + X<sup>11</sup> + X<sup>3</sup> + X<sup>2</sup> + X + 1 
* CRC-CCITT = X<sup>16</sup> + X<sup>12</sup> + X<sup>5</sup> + 1

The KG11 is a single [[DEC card form factor|quad]] card.

==External links==

* [http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/DEC-11-HKGAA-B-D%20KG11-A%20Exclusive-OR%20and%20CRC%20Block%20Check%20Manual.pdf KG11-A exclusive-OR and CRC block check manual] (DEC-II-HKGAA-B-D)
* [http://www.bitsavers.org/pdf/dec/unibus/KG11-A/KG11A_EngrDrws.pdf KG11-A Engineering Drawings]

[[Category: UNIBUS Peripherals]]