I wonder why impose this requirement to scroll using the blitter, since it's more resource intensive and less efficient than a smooth scroll using the screen offset register (just like it's done on the C64, amongst others).
The VDP copy command is too slow to do this. We are forced to use the "SET ADJUST" to make a clean scroll.
The vdp hmmc copy command can do 6-7 fps for a full screen scroll. The game as little less game area.
Judging by the tandy video the fps on pc are less than 6 fps
That's what I'm saying, it's too slow. Look at the Ys series, it's not full screen but it's already too slow.
i know the vdp is slow. but my question is another. can we get better performances even using the brute force scrolling approach on VDP with HMMM commands?
I've never measured tandy fps but i think we can get a bit more. Even if we considering what we have hw sprites and we are not not necessarily forced to move the entire screen
