[A89] Re: screen width and height


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[A89] Re: screen width and height




At 21:03 2002-02-07, you wrote:

>yep, an extra 30 bytes each line
>
> > can set the screen width and height. But VTI doesnt even support it! Is it
> > for compatibility with the 92?


Extra 10 bytes per line...

Basicly, why people don't change screen width is that it is extra work, and 
not really necessary.
You can just ignore the extra 10 bytes with not much overhead.
And also, that all the common sprite (and other graphics) routines people 
use are written for 30 byte wide screens, and has to be rewritten.
You can then also not use the same routines on both ti89 and ti92, which 
could be nifty.
And yes, the reason TI choose to make the virtual screen the same size as 
the ti92 was most probably for compatability with the 92.
And that VTI doesn't support it :)
So programs using it are a hazzle to debug.
The reason is that this feature wasn't known when VTI was first coded, and 
according to some old mail I got from rusty about it, implementing it would 
mean major code change in the screen handling.
Maybe the rumoured New Version will have it....

///Olle




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