Changes

: [http://www.hiarcs.net/forums/viewtopic.php?t=6768&start=78 Excalibur Electronics] by [[Ron Nelson|ChessChallenger]], [[Computer Chess Forums|Hiarcs Forum]], December 22, 2015

: [http://www.hiarcs.net/forums/viewtopic.php?t=6768&start=82 Excalibur Electronics] by [[Ron Nelson|ChessChallenger]], [[Computer Chess Forums|Hiarcs Forum]], December 22, 2015

* [http://www.hiarcs.net/forums/viewtopic.php?t=6768&start=191 Ron Nelson & Talking Chess Computers] by [[Ron Nelson|ChessChallenger]], [[Computer Chess Forums|Hiarcs Forum]], January 02, 2016

* [http://www.hiarcs.net/forums/viewtopic.php?t=7591 Excalibur Chess Products Ron Nelson designed/programmed] by [[Ron Nelson|ChessChallenger]], [[Computer Chess Forums|Hiarcs Forum]], January 05, 2016