Cheaper CGA (EGA RGB) to VGA converters - Are they any good? \ VOGONS

Cheaper CGA (EGA RGB) to VGA converters - Are they any good?

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First post, by andreja6

Posted on 2021-06-18, 22:19

andreja6 Offline

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I recently saw this listing on ebay after buying a Tandy 1000EX: https://www.ebay.ca/itm/253407215602?hash=ite … gAAAOSwRVJftD46
I can't afford an RGBi monitor at the moment, but this is at least close to my price range. I am very interested in getting a nice crisp VGA CRT monitor connected to it, which are still relatively cheaper (and which I have), but if these are crap, I might as well just try saving up for an RGBi monitor.

Has anyone had experiences with these?
I'd be very interested to hear how well they work.

Reply 1 of 3, by maxtherabbit

Posted on 2021-06-18, 22:43

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so those can actually be made into quite a capable scaler with custom firmware BUT they don't actually support TTL RGBI!!

yes, despite the name they do not handle CGA or EGA, only analog RGB

Reply 2 of 3, by zyga64

Posted on 2021-06-19, 06:45

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If you add necroware's MCE adapter https://github.com/necroware/mce-adapter it should work quite well !

There is also very interesting attempt (using Rapberry Pi) here MDA/CGA/EGA/VGA to HDMI using Raspberry Pi Zero

1) VLSI SCAMP /286@20 /4M /CL-GD5422 /CMI8330
2) i420EX /486DX33 /16M /TGUI9440 /GUS+ALS100+MT32PI
3) i430FX /K6-2@400 /64M /Rage Pro PCI /ES1370+YMF718
4) i440BX /P!!!750 /256M /MX440 /SBLive!
5) iB75 /3470s /4G /HD7750 /HDA

Reply 3 of 3, by maxtherabbit

Posted on 2021-06-19, 15:48

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zyga64 wrote on 2021-06-19, 06:45:

If you add necroware's MCE adapter https://github.com/necroware/mce-adapter it should work quite well !

my man scorp really loves reinventing the wheel 🤣, this appears to be exactly the same as the GGLabs unit

zyga64 wrote on 2021-06-19, 06:45:

There is also very interesting attempt (using Rapberry Pi) here MDA/CGA/EGA/VGA to HDMI using Raspberry Pi Zero

this is what I would recommend

a far more elegant solution for using TTL RGB on modern displays than converting it to analogue, digitizing it with the GBS, scaling it, and converting it back to analogue

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