My own understanding was that it was just that particular configuration of the EGA hardware that hadn't been tried before Carmack's implementation. This is som

My own understanding was that it was just that particular configuration of the EGA hardware that hadn't been tried before Carmack's implementation. This is someone who found out from Romero exactly what the Keen games did: http://www.vintage-computer.com/vcforum/showthread.php?30619-How-mcuh-more-advanced-was-a-NES-to-computers-at-the-time&s=321b699b28b1ad9dea53485136ab9ddf&p=225724#post225724 http://www.vintage-computer.com/vcforum/showthread.php?30619...