Without any changes apart from removing the check, ST Nethack runs fine in monochrome mode. I don't really know why the GEM port didn't enable it and told all ST High users to use the TOS (tty) version instead. As I said, 3.7 won't ever run on an Atari ST (unless there are some wild memory expansions that get around the MMU's 4 MB limit), but 3.6.7 should be possible on stock STs with 4MB. #atari #retrocomputing #nethack