On Sat, 22 Apr 2000, Floris 'Tamama' van Gog wrote:
> i'm once again trying to do something with my MSX, and right now i/m
> messing with sprites and vpoke/vpeek's (all pretty basic stuff, but you
> have to start somewhere). Now i'm trying to make a 2 color sprite by
> putting 2 sprites over eachother. This kinda works, but when i move it,
> it's ugly because you can see that one moves earlier than the other etc.
> So i was wondering, is there a way to see when to move the sprites
> (maybe by use of vrt retr.)? I assume there is because most games i
> played don't have this icky movement :-)
You can read bit6 of VDP status register 2 to find vertical retrace:
VDP(-2) and &H40
I forgot whether zero or non-zero means the vertical retrace is active.
But I'm not sure BASIC is fast enough to react to vertical retrace...
Bye,
Maarten
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