[Coco] Coco RGB to SVGA

[Joe Grubbs]

Same for me. I've paid a sizeable lump of cash for a similar product that has yet to actually materialize. But in time I may just get one of yours. :)



--- Original Message ---

From: "Roy Justus via Coco" <coco at maltedmedia.com>
Sent: June 20, 2015 4:46 PM
To: coco at maltedmedia.com
Cc: "Roy Justus" <rjrtty at aol.com>
Subject: Re: [Coco] Coco RGB to SVGA

When I get up to speed I can make 3 per week

Roy Justus
rjrtty at aol.com


-----Original Message-----
From: John B <trymyz at gmail.com>
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Sent: Sat, Jun 20, 2015 4:36 pm
Subject: Re: [Coco] Coco RGB to SVGA


Roy,

Great news.  Put me on the list for one with an enclosure.  How long
do
they take to produce?

Thanks,

John

On Sat, Jun 20, 2015 at 4:30 PM, Roy
Justus via Coco <coco at maltedmedia.com>
wrote:

> Dear coco friends,
>
>
>
I have nearly recovered   from illness and loss of my data files
> so I am
getting ready to restart production of my converter.
>
>       I also  want to
discuss some aspects of the process of conversion
> of Coco RGB.     First is
the noise some see with early version of my
> converter.   Most common is the
vertical bands seen during use.
> Another is the distortion seen with some
foreground/backround
> when viewing 80 column text.   Typically the blue in a
cls(7) backround
> in SECB.   At first I tried to eliminate this noise  but had
little
> success doing it.
>
>      The basic problem is this noise comes out of
the GIME chip and
> not from any outside source.    The reason it didn't show up
in the old
> 15 khz CRT displays is that they naturally filtered the signal due
to thier
> low bandwidth response.
>
>     The second problem is that my earlier
converters and other commercially
> availible units have a hard time keeping an
LCD display locked.    LCD's
> have
> such highbandwith the noise coming out of
the GIME confuses them and they
> shut down.
>
>     If you want to use a
converter that won't sync to an LCD try it on a
> older CRT SVGA
> display.
This applys to my old units and commercially availible ones.
>
>     To  address
these problems I have lowered the bandwith of my converter
> with
> some low
pass filtering on both the data lines and sync inputs.    I have
> also
changed
> the PLL tank circuit values to address the phase lock problems.   I
have
> tried my
> new converter on no less than five "picky" LCD's and they stay
on and
> sharp.
>
>      Another problem is the price of my converter.      It
cost
> approximately $100 per
> unit to build but I think that is way too high.
I  am going to offer a
> board level
> unit for $40  and  a unit with enclosure
for $60.   I don't do this to
> make money.
> i do it because monitors for the
Coco3 are becoming very rare and I enjoy
> it.
>
>    So let's light up the
summer with coco3 displays and send me your
> order for one.    A board level
unit comes with all the connections for
> a great repak project and the unit in
with enclosure looks good on the
> shelf with the coco3.
>
>
>
> Roy Justus
>
rjrtty at aol.com
>
>
> --
> Coco mailing list
> Coco at maltedmedia.com
>
https://pairlist5.pair.net/mailman/listinfo/coco
>

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