[Coco] Raster position

[Luis Antoniosi (CoCoDemus)]

you mean soft sprites right ?

well you can use the hborder interrupt. it will be triggered every scanline.


On Sat, Mar 9, 2013 at 4:25 AM, Sandro Mestre <san.mes at gmail.com> wrote:

> Hello, I'm new to this list.
>
> I would like to code a game for the Coco1/2. I usually code for the
> commodore c64 so I am aquainted with the 6502 but I also can code for the
> motorolas 6800, 6809 and 680000. During the last days I have coded a sprite
> engine for a computer with a 6809E and it is working great and then I
> thought that I could code also the game for the Coco/Dragon computers.
>
> I need to know if there is a register that I can poll to check the current
> raster position or if there is another way to know when the VDP starts
> painting the horizontal borders. I am asking this because as many will know
> if I paint the sprites there(borders) there will be no flickering. Another
> option I have would be to use double buffering but then this would eat much
> more memory and that would be perhaps a no go.
>
> How safe is it to use the high speed poke on a game? Do coco games use it?
>
> Thanks
>
> Wood
>
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