EGA display adapter, CGA monitor? \ VOGONS

EGA display adapter, CGA monitor?

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First post, by keenerb

Posted on 2016-06-08, 17:17

keenerb Offline

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Posts: 1075
Joined: 2006-11-13, 16:24

I've picked up a CGA/EGA PEGA1A video card off of Ebay and I'm surprised to come across comments saying that the CGA monitor I have might be compatible with some/most of the EGA display modes.

What I've gathered is that the Tandy CM-11 monitor I have might support CGA modes, and also EGA modes up to 320x200 16 color?

Can anyone confirm or refute that this might be possible? It'd be a pleasant surprise if true.

Reply 1 of 2, by h-a-l-9000

Posted on 2016-06-08, 17:38

h-a-l-9000 Offline

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Only the 640x350 video modes (text and graphics) are EGA only. The others are CGA monitor compatible. There are however "superEGA" cards that can do some higher frequencies. So configure the card properly for a CGA monitor.

1+1=10

Reply 2 of 2, by Scali

Posted on 2016-06-08, 18:08

Scali Offline

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Joined: 2014-12-13, 14:24

Being backward-compatible with CGA monitors was a specific feature of IBM EGA.
It's the reason why you can only get the fixed 16 RGBI colours in 320x200 mode. In 640x350 there are 64 colours available.

http://scalibq.wordpress.com/just-keeping-it- … ro-programming/

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