[Coco] rgb2vga

[Cocodemus]

Composite you use on tv direct. That composite on rgb is monochrome

Sent from my iPhone

> On Sep 25, 2016, at 12:08 PM, Mathieu Chouinard <chouimat at gmail.com> wrote:
> 
> you are talking of the rgb connection of the msx2?
> can I use the composite signal instead?
> Mathieu
> 
>> On Sun, Sep 25, 2016 at 1:45 PM, Cocodemus <retrocanada76 at gmail.com> wrote:
>> It does not work with msx2, the signal keeps sinking. There is something on the vdp that cause this with the differential ports on altera.
>> 
>> Sent from my iPhone
>> 
>>> On Sep 25, 2016, at 6:58 AM, Mathieu Chouinard <chouimat at gmail.com> wrote:
>>> 
>>> Hi,
>>> Will an adaptation of the attached schematic
>>> works for a commodore 128 or do I need to
>>> go with the board modification ?
>>> Also does any one as the cable schematic
>>> for a MSX2+ (Sony HB-F1XDJ) ?
>>> I can probably figure out the cable for
>>> the atari 130xe (with a VBXE installed)
>>> 
>>> 
>>> Mathieu
>>> 
>>>> On Tue, Sep 20, 2016 at 11:23 AM, Mathieu Chouinard <chouimat at gmail.com> wrote:
>>>> Hi Ed,
>>>> thanks for the information.
>>>> I managed to score a few nice things on ebay:
>>>> 1 MSX2+, 1 Atari 130 XE, 1 Commodore 128 and 1 Ti-99/4A
>>>> all still in the box ... hours of fun (and probably cursing too)
>>>> at the horizion ...
>>>> Mathieu
>>>> 
>>>>> On Tue, Sep 20, 2016 at 11:19 AM, Zippster <zippster278 at gmail.com> wrote:
>>>>> Hi Mathieu,
>>>>> 
>>>>> R, G, and B are taken in on pins 1,2,3 as usual, composite sync on pin 13.
>>>>> 
>>>>> Here’s the routing for the board I did (Luis’s original board has the same circuit).
>>>>> <https://drive.google.com/open?id=0B1sgl615FlGnWmhISkRVZkRjU0k <https://drive.google.com/open?id=0B1sgl615FlGnWmhISkRVZkRjU0k>>
>>>>> 
>>>>> As you can see, there’s no separate hsync and vsync on the connector, so for the
>>>>> C128 RGB port, you would probably want to run some patches between the RGBI and
>>>>> analog RGB connectors.  You’ll also need to patch the intensity line (with a voltage divider)
>>>>> to the FPGA IO header as detailed on Luis’s site.
>>>>> 
>>>>> An easier approach is probably to have one end of your cable a 10 pin header connection
>>>>> and just use the analog port.
>>>>> 
>>>>> A note of caution…  as you probably already know, the C128 will be putting out TTL level
>>>>> signals, so you’ll want a series resistor on the RGB lines (to act as dividers with the already
>>>>> present terminating resistors on the board) in order to drop the voltage to levels that won’t
>>>>> harm the FPGA IO.  Also be sure you’re running with the ground fix on the hsync divider, for the
>>>>> same reason.
>>>>> 
>>>>> You may have to adjust the FPGA programming to sync the pixel clock with the one in the C128
>>>>> more closely for the intensity signal to be applied to the video conversion in a stable manner.
>>>>> 
>>>>> This issue could be avoided by using some logic and a simple resistor DAC to create pseudo-analog
>>>>> signals from the TTL inputs before sampling.
>>>>> 
>>>>> I hope that helps, and good luck.  :)
>>>>> 
>>>>> 
>>>>> - Ed
>>>>> 
>>>>> 
>>>>> 
>>>>>> On Sep 20, 2016, at 9:17 AM, Mathieu Chouinard <chouimat at gmail.com> wrote:
>>>>>> 
>>>>>> On Tue, Sep 20, 2016 at 9:48 AM, Robert Gault <robert.gault at att.net> wrote:
>>>>>>> Mathieu Chouinard wrote:
>>>>>>>> 
>>>>>>>> what is the pinout of the rgbin connector?
>>>>>>>> Mathieu
>>>>>>> 
>>>>>>> 
>>>>>>> 9  7  5  3  1
>>>>>>> .  .  .  .  .
>>>>>>> 
>>>>>>> .  .  .  .  .
>>>>>>> 10 8  6  4  2
>>>>>>> 
>>>>>>> RGB pins on Coco3
>>>>>> sorry I was talking about the DB15 RGBIN connector.
>>>>>> I'm trying to build a cable for a commodore 128
>>>>>> 
>>>>>> --
>>>>>> A te quaeso, sicut in Aeneidos libro quarto Aeneas, elocutus
>>>>>> desiderium erigendi suum obeliscum in templo Venereo Didonis, ab ea
>>>>>> quaesivit, tuae domi an meae?
>>>>>> 
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>>>>> 
>>>>> 
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>>>> 
>>>> 
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>>>> A te quaeso, sicut in Aeneidos libro quarto Aeneas, elocutus
>>>> desiderium erigendi suum obeliscum in templo Venereo Didonis, ab ea
>>>> quaesivit, tuae domi an meae?
>>> 
>>> 
>>> 
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>>> desiderium erigendi suum obeliscum in templo Venereo Didonis, ab ea
>>> quaesivit, tuae domi an meae?
>>> <pull2-rgba-xor.gif>
>>> 
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>> 
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> 
> 
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> A te quaeso, sicut in Aeneidos libro quarto Aeneas, elocutus
> desiderium erigendi suum obeliscum in templo Venereo Didonis, ab ea
> quaesivit, tuae domi an meae?
> 
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