VGA output on ZXUNO+

Dudas, cuestiones, sugerencias y peticiones en general sobre el proyecto / Questions and requests about the project
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zx81zx81
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Registrado: 26 Feb 2020, 22:57
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VGA output on ZXUNO+

Mensaje por zx81zx81 » 26 Feb 2020, 23:40

Hi Folks,

I am trying to build my own VGA output on ZXUNO+ (since there is ony a composite output, and it looks like there several cores that are not working properly with that, such as coleco with a B&W output, vectrex that displays two images etc ...).

I was googling and looking here in this forum to find the ZXUNO+ schematic (especially the expansion connectors and RJ45 connector).
There are many documentations for the original ZXUNO but unfortunately nothing i could get on the newer version.

Using a multimeter i was able to get some of the pinout of the RJ45 connector that can be used to build a SCART cable, such as audio L+R, and also some of the video signals (looking at the outputs of the THS7374), but i am not sure that those signals are actually RGB+Sync or CVBS/Y/P.

Looking at the expansion connector, i was also able to identify some of those signals (since they are both connected the RJ45 connector and the expansion connector), but i prefer to have official documentation / information, since i don't want to mess up my freshly bought ZXUNO+

Any help would be appreciated :maestro:

Regards,

Zx

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antoniovillena
Mensajes: 2611
Registrado: 27 Sep 2015, 20:41

Re: VGA output on ZXUNO+

Mensaje por antoniovillena » 27 Feb 2020, 15:26

zx81zx81 escribió:
26 Feb 2020, 23:40
Hi Folks,

I am trying to build my own VGA output on ZXUNO+ (since there is ony a composite output, and it looks like there several cores that are not working properly with that, such as coleco with a B&W output, vectrex that displays two images etc ...).

I was googling and looking here in this forum to find the ZXUNO+ schematic (especially the expansion connectors and RJ45 connector).
There are many documentations for the original ZXUNO but unfortunately nothing i could get on the newer version.

Using a multimeter i was able to get some of the pinout of the RJ45 connector that can be used to build a SCART cable, such as audio L+R, and also some of the video signals (looking at the outputs of the THS7374), but i am not sure that those signals are actually RGB+Sync or CVBS/Y/P.

Looking at the expansion connector, i was also able to identify some of those signals (since they are both connected the RJ45 connector and the expansion connector), but i prefer to have official documentation / information, since i don't want to mess up my freshly bought ZXUNO+

Any help would be appreciated :maestro:

Regards,

Zx
Hi. For VGA you can buy one of these adapters:

https://es.aliexpress.com/item/4000530363014.html

Also attached pinout
Adjuntos
pinout.png

zx81zx81
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Registrado: 26 Feb 2020, 22:57
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Re: VGA output on ZXUNO+

Mensaje por zx81zx81 » 27 Feb 2020, 21:11

Thanks a lot, you answered all my questions.

I succeed to build my own cable and to use the VGA output :boingg:

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