[Coco] Coco3 triple monitor setup

[Gene Heskett]

On Friday 28 December 2018 15:28:58 L. Curtis Boyle wrote:

> Yes.
>
Most packs had an rca jack for composite outputs, but the monitor I had 
was ttl, so I rigged a db9 for ttl outputs, giving much less wibbles. 
Then I modified the chip inits in the driver to give a 25 line screen 
and a much bigger used area. Only a slight loss of HV because that 
resulted in an h-synch rate in the 18.5 kilohertz area. The loss of High 
Voltage also made the pix bigger.  Each little bit helped.  A slower 
video clock crystal would have been even better, but I was running what 
I brung. And it worked well. Generally speaking , you can run the h 
sweep faster, but not slower than its designed for. Slower starts to 
saturate the iron in the hv transformer, and even a microsecond too long 
opens the door to let the smoke clear. And we all know it doesn't work 
anymore after you've let the smoke out...

> Sent from my iPhone
>
> > On Dec 28, 2018, at 11:56 AM, rietveld rietveld
> > <rietveldh at hotmail.com> wrote:
> >
> > How did that work?   Was there a seperate display hookup on the pak?

yes.

> > Sent from my BlackBerry
> >  Original Message
> > From: L. Curtis Boyle
> > Sent: Friday, December 28, 2018 1:40 PM
> > To: CoCoList for Color Computer Enthusiasts
> > Reply To: CoCoList for Color Computer Enthusiasts
> > Subject: Re: [Coco] Coco3 triple monitor setup
> >
> >
> > You could display different things on different monitors with things
> > like the 80 column cards (like WordPak).
> >
> > Sent from my iPhone


Cheers, Gene Heskett
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