nesdev.org

They check if bit 0 of register B is set on startup. If it is, then it's on GBA.

I looked at rgbasm and it uses lots of unconventional syntax that looks like asm from 20 years ago, different from all the other assemblers I've used. For example, directives don't start with . as in modern assemblers. I'll have to give it a try, along with TASM (assuming TASM's source is also avai...

I don't know how it works from the hardware side of things, but it's basically as you say that that lines rendered are taken into account. Another thing is that if you change SCX during the line in VRAM mode then the lower 3 bits of horizontal scroll value can't be changed until next line so that al...

Is wla-dx where it's at these days? rgbasm should handle ldh like you want, but I guess it's a pain in the rear to switch assembler once you're used to the other one.