[Coco] Graphics on NitrOS9 Level 1 v3.3.0 (CoCo 1)

[David Ladd]

Rogelio,

At this point in NitrOS-9 L1 there is no such thing as GFRO.
VTIO passes display codes $15 up to GrfDrv.

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On Wed, Feb 7, 2018 at 5:31 PM, Rogelio Perea <os9dude at gmail.com> wrote:

> On Wed, Feb 7 2018, L. Curtis Boyle wrote:
>
> Rogelio - just to give you an update. The patch partially worked. It now
> > loads/links Grfdrv, and can execute command codes $15 and up. But there
> are
> > two bugs still:
> > 1) Set Point and Erase point ($18 and $19) crash the system. Not sure why
> > yet. All other commands seem to work.
> > 2) The very first Grfdrv related command you send gets eaten; subsequent
> > ones all work fine.
> >
> > As David and I have time to look into it further, we will try to fix
> these
> > two remaining bugs.
> >
> > Please let us know if you find anything else.
>
>
> Good!
>
> My experience with OS Graphics on Level 1 comes mostly from release 2.x
>
> Years ago I had played with some routines in Basic09 with release 1.x, and
> when I upgraded to 2.0 I was surprised to see none of my programs worked,
> kept getting a Module Not Found Error, that was until I got to *fully* read
> (yes, bad boy here) the manual addendum for 2.0 where it stated the changes
> in the graphics management with the requirement to have GRFO to be loaded
> either with the Boot or manually prior to  doing anything with graphics,
> Basic09's GFX included.
>
> So on stock OS9 Level 1 v2 the system does not automatically load GRFO when
> first needed (as Basic09 would load GFX upon first call); the GRFO module
> needs to be in memory already.
>
> I'm curious to know if GRFO module pre-load scheme was also to be followed
> by NitroOS9 or has the functionality been implemented so the OS loads it
> once the graphics function is called.
>
>
> -- RP
>
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