[Coco] RGB2VGA DE0-Nano Programming Help - Resolved

[Gene Heskett]

On Saturday 01 August 2015 05:36:40 K. Pruitt wrote:

> ----- Original Message -----
> From: "Gene Heskett"
> Sent: Saturday, August 01, 2015 1:14 AM
> Subject: Re: [Coco] RGB2VGA DE0-Nano Programming Help - Resolved
>
> > On Saturday 01 August 2015 04:03:43 K. Pruitt wrote:
> >> By the way, I am missing the left character in 40 and 80 character
> >> widths. I've tried adjusting it every which way but I just can't
> >> get the whole 40 or 80 characters on the screen.
> >>
> >> I'm using an NEC Multisync LCD1530V as the monitor.
> >>
> >> Any tips or suggestions would be appreciated. Perhaps a different
> >> monitor would be better?
>
> <snip>
>
> > That monitor might be sync signal polarity sensitive, which could
> > offset the display timing by several microseconds.
>
> Thanks, Gene. Due to the wonder of cut & paste and google, I was able
> to actually learn (sorta) what "sync signal polarity sensitive" means
> and why it would cause such a delay. The monitor is at least 15 years
> old and was cheap back then. It works great, but I could see it not
> having the best components in it.
>
> Other than the lost left column, the picture is fantastic. Very easy
> on the eyes
> I'll start looking for a suitable monitor or tv with vga input for my
> CoCo.
If it has good britness yet, running the sync thru a gate of a 7404 or 
7406 to invert it migh be justy what the Dr ordered.  Most of those were 
looking for a negative pulse, and I have a faint memory that the coco's3 
sync pulse were positive.

I have one of Roy J's kits, and have a pretty decent picture on a retired 
Point of Sale LCD monitor I bought off fleabay a year or so back.  No 
case, just the panel, so I cut some plywood right triangles and made it 
a stand.  It even has a touch screen output that, when I ever get done 
with some other projects around here, I will measure & feed to my serial 
mouse driver and see if it can make like a mouse. $65 & shipping at the 
time.  Or re-write & rename the driver.

> >> >> --
> >
> > Cheers, Gene Heskett
> > --
> > "There are four boxes to be used in defense of liberty:
> > soap, ballot, jury, and ammo. Please use in that order."
> > -Ed Howdershelt (Author)
> > Genes Web page <http://geneslinuxbox.net:6309/gene>
> >
> > --


Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>