SegaXtreme
I was trying to set up the VDP2 in a way to get a 512x256x32bit bitmap mode in a 320x240x24bit resolution using NBG0... so after reading that darned long PDF file I found some registers that apparently need to be set:
-TVMD to %1000000000010000, to set the proper resolution
-EXTEN to 0 (dunno why but Antime does this in copper2.asm)
-BGON to $101, to enable NBG0 and turn it's transparency off
-CHCTLA to %1000010 to set a 512x256x24bit bitmap
But I feel that isn't all - I mean, where exactly IS NBG0 located in VRAM? Do I need to set that somewhere? Moreover, what is this thing with windows? I don't have a clue how they fit in with the multiple screens thing...
/me is really really confused now :-(
-TVMD to %1000000000010000, to set the proper resolution
-EXTEN to 0 (dunno why but Antime does this in copper2.asm)
-BGON to $101, to enable NBG0 and turn it's transparency off
-CHCTLA to %1000010 to set a 512x256x24bit bitmap
But I feel that isn't all - I mean, where exactly IS NBG0 located in VRAM? Do I need to set that somewhere? Moreover, what is this thing with windows? I don't have a clue how they fit in with the multiple screens thing...
/me is really really confused now :-(