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

[Rogelio Perea]

On Sat, Feb 10 2018, David Ladd wrote:

Rogelio,
>
> So you will have to manually use the repo to build new disk images with the
> sources that are up on sourceforge.net now.
>
> So far with L. Curtis Boyle going through the code and testing we have done
> we have most of it working.
>
> So the strange issues with the set point and erase point still do strange
> things, but if you load GrfDrv before issuing any graphics commands $15-$1F
> then set point and erase point seem to work fine.
>
> Otherwise Curtis has some ideas for possible speed optimizations for level
> 1 VTIO and GrfDrv, but that will come later as time permits.
>

My OS9 assembler noobness shows so bear with me.

I have tried assembling VTIO.ASM on both my CoCo 1 and 3 to no avail, both
running NitrOS9 3.3 at their respective levels of course.

My directive has been:

asm /d1/vtio.asm o=/d1/vtio l > /d1/vtio.lst

Have the OS disk in /d0 and the VTIO work disk on /d1 - using the CoCo SDC

The LST file shows a lot of ERROR: BAD LABEL and ERROR: BAD INSTR entries
from the very beginning of the assembly process. The resulting VTIO
executable reports a Header Incorrect upon running IDENT on it.

I'm inclined to think I am doing something wrong here...

-- RP