The board, originally depicted as a chalk board, was retconned into a digital display screen with a Wi-Fi connection to his CPU.
(In those days his name was given as "Saigon John" and his war injury is described as taking a shot (presumably friendly fire) while smoking a bong (improvised from his M16) with a North Vietnamese soldier, making his tunnel rat story presumably a retcon.
A slave driver from Saturn (later retconned as a subatomic earthlike world near or within Saturn), Eviless and Duke Mephisto Saturno (of the Saturnian Invasion Force) battled Wonder Woman.
Due to the success of The Long Halloween, the events of the story have generally been accepted into continuity as the "official" story of Batman's early years, given that Zero Hour retconned the events of Batman: Year Two and rendered them non-canonical.