MDA/CGA/EGA to VGA Converter Released!

Discussion about old graphics cards, monitors and video related things.

Re: MDA/CGA/EGA to VGA Converter Released!

Postby retrocanada76 » 2018-11-24 @ 09:59

Yep, but that would only work for these VGA-like modes. Can it boot from these modes ? Otherwise you'd get a blank post.

Unless it is a multisync monitor that accepts both 15hz and 31Khz.
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Re: MDA/CGA/EGA to VGA Converter Released!

Postby ibmapc » 2018-11-24 @ 17:22

retrocanada76 wrote:Yep, but that would only work for these VGA-like modes. Can it boot from these modes ? Otherwise you'd get a blank post.

Unless it is a multisync monitor that accepts both 15hz and 31Khz.

Yeah, that was on my mind also. Would need to put a command in autoexec.bat to switch to 640x480. I don't think EGA Wonder can be set to boot in the higher resolutions. Would be great to come up with way to switch between the MCE2VGA and this simplified "Adapter" or "Resistor Array". Maybe something like this https://www.amazon.com/Duttek-2-Port-Monitor-Sharing-Switching/dp/B075Q54BTP/ref=pd_lpo_vtph_147_lp_t_3?_encoding=UTF8&psc=1&refRID=N8ZXAA3KE08BRD5YYQBR with a Y cable supplying signal to both the MCE2VGA and the "Resistor Array". My question is, would the monitor tolerate the "Out Of Spec Frequency" when the switch is not set to the correct position. I think a modern LCD panel would probably just go blank or display an error message. But, a CRT display may be damaged by the "Out Of Spec Frequency".
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Re: MDA/CGA/EGA to VGA Converter Released!

Postby suntac » 2018-11-30 @ 10:38

retrocanada76 wrote:640x480 and 800x600 are on the VGA spectrum. The device does not have memory enough for holding an entire frame. Unless you design a pass-through mode only converting the TTL to analog. But since I don't have one of these and I don't plan buying one I won't bother.


Hi retrocanada76,
would you be willing to update the firmware to support EGA cards with 16.000MHz pixel clock?
Here is an example of such a card and I'd guess there are other models too:
http://www.vgamuseum.info/index.php/news/item/467-udl-c3
Thanks.
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Re: MDA/CGA/EGA to VGA Converter Released!

Postby retrocanada76 » 2018-11-30 @ 15:39

sorry I can't do it blindly. If I don't have one of these I cannot test. But this is something you can try yourself, just learn a bit about quartus II and how to change the PLL's. It's not that complicated.
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