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

[L. Curtis Boyle]

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.

L. Curtis Boyle
curtisboyle at sasktel.net



> On Feb 5, 2018, at 10:12 AM, Rogelio Perea <os9dude at gmail.com> wrote:
> 
> On Mon Feb 5 2018, David Ladd wrote:
> 
> So after some looking at NitrOS-9 L1 it does seem there is a issue with
>> VTIO and possible GrfDrv as well.
>> 
>> So far VTIO does not seem to automatically load GrfDrv as it should.  If
>> you merge GrfDrv in the OS9Boot file on startup so it is in memory then
>> when VTIO tries to call GrfDrv the system locks up.
>> 
>> Graphics display codes that start with $15 to $1F are directed to go
>> through GrfDrv.  Which this functionality seems to be currently broken...
>> 
> 
> Thanks for the reply and the tech insight David, will take care of
> reporting suspected bugs at the Sourceforge page as noted.
> 
> 
> -- RP
> 
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