According to Ron Nelson, by the time Excalibur Alexandra was conceived, the H8 ROM’s were being phased out of production, therefore computers such as Excalibur Ivan II or Excalibur Alexandra were developed around the SPLB32A processor from the manufacturer Sunplus. This created its own unique set of problems as Nelson’s H8 program had to be translated to work with this new processor which has a 6502 core. This processor had less available RAM therefore in order to make the program fit to these new lower specifications , adjustments were made to the program which included the removal of Nelson’s Attack Bit Map Tables and the commenting out of the Ponder routine, which were both important strength of play features that existed in Nelson’s H8 program. All these adjustments resulted in a new lesser strength chess program for use with the SPLB32A with its own unique play behavior.
This program was also used later for many other Excalibur chess computers with various adaptations to different processing chips. Excalibur Einstein LCD Chess Wizard running on a Sitronix 65C02S cpu, was one of the last computers to be sold using this program prior to Excalibur’s bankruptcy and sale to EB Electronics on Wednesday July 1st, 2009.
Excalibur Einstein LCD Chess Wizard was produced for Excalibur by Wide Concepts Limited in Hong Kong.
For reading of Ron Nelson comments go to: Hiarcs Forum