Thanks to the help and advice of kind people on this and other forums, we managed to complete the program for the formation of chess endgames. Supports all known graphics adapters from the 1980s, except MDA (without OGA). You can read more about the purpose of the program on Wikipedia.

Known issues:
• Occasionally can impose a piece in the 4th pair.
• Sometimes does not give a piece to white or black.
• Can form positions that are not consistent with the rules.

Thank you all for your support and attention!