Hi, welcome to the forum.
Currently we are discussing the options for the ASCII version on Catalina. The main problem is that ADOM uses the Carbon framework to render stuff but that's not available anymore (since it was a 32 bit framework). Making the ASCII version work on Catalina therefore requires a complete rewrite of all the graphic routines.
Since we're quite busy working on Ultimate ADOM, this has a very low priority right at the moment. I hope this helps.
“It's a cruel and random world, but the ChAoS is all so beautiful.” ― Hiromu Arakawa