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EGA vs CGA Monitors

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Justin Wintour

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Jan 1, 1996, 3:00:00 AM1/1/96
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Does anybody know the differences between the original IBM PC color
display (aka CGA), and its decendant the EGA?

My understanding was that EGA supports the same resolutions as CGA, but
with more colors. True?

They both use the same 9-pin D-Sub connector. Is the pinout identical?
Are the signal levels the same?

I am trying to use a CGA monitor on this EGA card. Is this going to
work?

Any and all info or pointers to info would be vey much appreciated!

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| Justin Wintour | Bell-Northern Research | Internet: jus...@bnr.ca |
| Dept 7B43 | PO Box 3511, Stn C | Voice: (613)763-5983 |
| Carling Stop 277 | Ottawa, Ont. K1Y 4H7 | FAX: (613)765-3313 |
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DOUG BOYER

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Jan 2, 1996, 3:00:00 AM1/2/96
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>You cannot use a CGA monitor with a EGA card unless the EGA card is
designe to be configured for the CGA by way of jumper settings. The CGA
had a resolution of 640 X 200. The EGA has a resolution of 640 X 350.
The CGA monitor cannot be run at that resolution. The EGA also runs at
a higher frequency. If you have the manual for the EGA adapter, it may
work, otherwise you are out of luck.


james_richard

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Jan 5, 1996, 3:00:00 AM1/5/96
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In article <4c9rvh$o...@bcarh8ab.bnr.ca>, Justin Wintour <jus...@bnr.ca> writes:

>Does anybody know the differences between the original IBM PC color
>display (aka CGA), and its decendant the EGA?
>
>My understanding was that EGA supports the same resolutions as CGA, but
>with more colors. True?
>
>They both use the same 9-pin D-Sub connector. Is the pinout identical?
>Are the signal levels the same?
>
>I am trying to use a CGA monitor on this EGA card. Is this going to
>work?
>
>Any and all info or pointers to info would be vey much appreciated!
>
> ---------------------------------------------------------------------
>| Justin Wintour | Bell-Northern Research | Internet: jus...@bnr.ca |
>| Dept 7B43 | PO Box 3511, Stn C | Voice: (613)763-5983 |
>| Carling Stop 277 | Ottawa, Ont. K1Y 4H7 | FAX: (613)765-3313 |
> ---------------------------------------------------------------------

EGA will support CGA resolutions (640x200 & 320x200),
but EGA will also do (its default of) 640x350.

If I remember well, CGA does a max of 16 colours,
while EGA will do 16 of 64 colours.

No! The pinouts for CGA are different for EGA.
If you have an EGA card, there are usually switches to support CGA monitors.

I hope this sheds light (6-bits worth)(2^6=64, EGA, Get-It?, Get-It?)
on your query!

James Richard
{JRic...@TUNS.CA, http://www.tuns.ca/~jrichard/}
'No Assembler Required!'

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