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DB9 to DB15 Video Adapter

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Name: Peter S.
Date: October 10, 2004 at 18:53:09 Pacific
OS: MS-DOS 5.00
CPU/Ram: 386-40
Comment:

Hi, I'm not really sure where to post this question: I know they make a video adapter that has 15 Female on one end and 9 male on the other. That seems to work fine. But why do they make the opposite when you can't use a CGA on a VGA Card. (Wouldn't everyone just buy these adapters instead of uograding to VGA?!) Or, is there a way using ANSI.SYS to make DOS display on CGA or monochrome?

Thanks!



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Response Number 1
Name: jboy
Date: October 10, 2004 at 19:37:36 Pacific
Reply:

What are you asking? DOS displays on any of those monitor types without the need for drivers.

"video adapter that has 15 Female on one end and 9 male on the other"

Wha.. ? Do you mean a cable?

You cannot directly connect CGA/EGA monitors to a VGA port - or vice versa - radically different signals. Some older 'hybrid' VGA cards also had an EGA port, but that's not the same thing at all.



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Response Number 2
Name: Peter S.
Date: October 10, 2004 at 20:12:40 Pacific
Reply:

Yes, I was referring to a cable. I have used a VGA monitor on a CGA computer before.
I guess I should have clarified this before.
I have a 386 Magitronic I still use with a VGA port. The VGA monitor blew out after being on almost 24/7 for who knows how long. I have a cable with 9 Female and 15 Male. I have a CGA monitor. When I plug the CGA monitor into the cable, and the other end into the VGA port, all I get is multi-colored lines. I know the monitor is good.


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Response Number 3
Name: jboy
Date: October 10, 2004 at 21:01:56 Pacific
Reply:

Is there a question there?

"all I get is multi-colored lines."

Not surprisingly - CGA/EGA use TTL (transisitor-transistor logic), VGA uses analog.

There are analog to digital converters etc. (ADC & DAC) - but that is not the same as directly connecting with a simple cable.

Pinouts may be a factor as well


Tech Support: "I need you to boot the computer."


Customer: THUMP! Pause. "No, that didn't help."


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Response Number 4
Name: wizard-fred
Date: October 11, 2004 at 02:59:00 Pacific
Reply:

There are some monitor cables that are 15 pin to 9 pin, they are not adapters. I believe I have a Nanao and a Samsung monitor that has a 9 pin connector on the monitor.


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Response Number 5
Name: jboy
Date: October 12, 2004 at 10:27:33 Pacific
Reply:

Sure - I have an oddball IBM PS/1 SVGA from '93 that takes a 15-9 male/male cord, but that's by design.



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Customer: THUMP! Pause. "No, that didn't help."


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