“Register bit twiddling.” Setting all the modes that all their various cards can operate in, with the associated code for sending the bit updates over the connection bus. Tedious stuff that’s very prone to copy-paste errors if written by hand.
At some point you have to take AMDs word for it that these codes = this functionality, but if the right graphics come out then it can’t be so wrong.
Oh yeah. Partying like its 1989 and I’ve booted up my Amiga. Let’s get some unicycling friends in here and do some hacking in 3D.