[Coco] NitrOS-9 GET/PUT buffer questions

[Boisy G. Pitre]

On Mar 17, 2012, at 1:36 PM, James Dessart wrote:

> On Sat, Mar 17, 2012 at 2:14 PM, Robert Gault <robert.gault at att.net> wrote:
> 
>> Can't answer all the questions. You are asking about the Windowing system
>> calls which normally would be issued with the display command. For example,

GrfDrv is in charge of this I believe, and memory for GP buffers are allocated and managed by it, I believe.  I don't think the memory for these comes from the OS's 64K address space.

Remember, the source is open and available (and browsable over the Internet) so it's possible to know what happens by looking directly at the source.

> Right, which I've been reading about. Is there a more direct interface
> to the screen through NitrOS-9, or would I have to hit the hardware
> directly?

VDGInt has support via SS.DScrn/SS.AScrn/etc GetStat calls which return the address of the screen.

>> There is no conversion of data if you mismatch the screen type and data. I
>> presume there must be room in your process space to map in the buffer or you
>> won't be able to work with it. The buffer itself probably also exists in
>> system space.
> 
> The comments in the code seem to indicate that it does convert the data.
> 
> -- 
> James Dessart
> <http://ideaoubliette.blogspot.com/>
> 
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