[Coco] rgb2vga

[Mathieu Chouinard]

thanks

On Sun, Sep 25, 2016 at 8:47 PM, Cocodemus <retrocanada76 at gmail.com> wrote:
> 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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>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> 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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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?