[Coco] Coco-3 to the GBS-8220 upscaler interfacing

[Kandur]

At the moment I have no way to display a 40 character screen, only 32 and 80.
It was very difficult (at least for me), to take these photos of the LCD screen.
They were taken with a 10 year old camera, on a cheap Acer X233H 23" monitor. 
The characters look thicker on the photos, then on the screen. 
I haven?t fiddled with the adjustments, I'm happy with the display as it is.

http://qdv.pw/eng/_photos/Computers/Coco/IMG_6058a-1024.jpg

http://qdv.pw/eng/_photos/Computers/Coco/IMG_6047a-1024.jpg

http://qdv.pw/eng/_photos/Computers/Coco/IMG_6039a-1024.jpg

Kandur

Friday, June 6, 2014, 2:48:10 PM, you wrote:
> What do 40 and 80 column displays look like?
> On Fri, Jun 6, 2014 at 4:44 PM, Kandur <k at qdv.pw> wrote:

>> Progress report.
>> Having read that, I just connected the H+V sync wires from the Coco,
>> to a 10k pot's one side, the  GBS-8220 board's 'S' input to the middle,
>> and a 1k resistor to the other side, the other end of it was grounded.
>> Got a rock solid display. See the photos.

>> http://qdv.pw/eng/_photos/Computers/Coco/coco-3%20to%20GBS-8220_6034.jpg
>> http://qdv.pw/eng/_photos/Computers/Coco/coco%20screen_6013-1024.jpg

>> Like you said, the display is ok, but not as good as on an analogue crt
>> monitor,
>> Can we have anyting better for $27 and free shipping?
>> Would you mind to share the web site's url,  you quoted?

>> Kandur

>> Thursday, June 5, 2014, 5:16:30 AM, you wrote:
>> > On Wed, 4 Jun 2014, Kandur wrote:

>> >> Thanks.
>> >> This circuit seem to assume negative sync inputs,
>> >> while the Coco-3 has positive sync outputs.

>> > From the web site:
>> > <quote>
>> > The sync signal combiner has a system to adjust to different sync
>> > polarities so that it always makes correct
>> > composite sync signals. VGA
>> > card uses different sync signal polarities to tell the monitor which
>> > resolution is used. This circuit adjusts to
>> > sync signal polarity changes
>> > in less than 200 milliseconds, which is faster than setting time of a
>> > normal VGA monitor in the display mode change.
>> > </quote>
>> > It's actually a very clever design.
>> > --

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