[Coco] RGB2VGA DE0-Nano Programming Help - Resolved

[Zippster]

Kelly,

Leftmost column missing in 80 column?

I don’t think it’s the monitor, or the RGB2VGA board.

I had one CoCo3 out of my two that exhibited this with the RGB2VGA.
Trying to track this down, I used multiple RGB2VGA boards, and swapped
the GIME chips in the two machines.  

The issue followed the GIME, so apparently it was something in the GIME
video output.

The only fix I was able to come up with was running with the “shrink” DIP
switch setting on.  It worked fine like that for me, with the slightly smaller screen.

- Ed



> On Aug 1, 2015, at 4:36 AM, K. Pruitt <pruittk at roadrunner.com> 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.
> 
>>> >>
>>> >>
>>> >> --
>> 
>> 
>> 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>
>> 
>> -- 
> 
> 
> -- 
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