[vcf-midatlantic] Monochrome and VGA together?

Richard Cini rich.cini at gmail.com
Mon May 13 07:45:00 EDT 2019

Thanks Thomas. I have all sorts of monitors in the shop but nothing that seems to work on the monochrome port. I noticed that pin 7 is the video output. Is it possible to connect that to the video in of a more modern monitor? For example I have Commodore and other monitors with A/V (not composite) in.

I have an NEC Multisync (original one) which I feel should work but it’s not getting the signal. I guess I need to fiddle around a bit more with it this week.


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From: vcf-midatlantic <vcf-midatlantic-bounces at lists.vcfed.org> on behalf of Thomas Fuchs via vcf-midatlantic <vcf-midatlantic at lists.vcfed.org>
Sent: Monday, May 13, 2019 7:30 AM
To: vcf-midatlantic
Cc: Thomas Fuchs
Subject: Re: [vcf-midatlantic] Monochrome and VGA together?

Yes, monochrome and color cards (including VGA) use different address spaces and thus can be run side-by-side with two monitors. Many DOS-based IDEs use this for debugging, e.g. Borland’s IDEs.

At the DOS prompt you can use “mode color” and “mode mono” to switch between the monitors.

Thomas F.

> On May 12, 2019, at 3:21 PM, Richard Cini via vcf-midatlantic <vcf-midatlantic at lists.vcfed.org> wrote:
> All —
> I’m working on another project (with an early version of Windows) and for debugging on my AT, I need to run both a monochrome and EGA/VGA together. I’m quite rusty on this because I remember doing this long ago but it might be pre-VGA.
> Is this possible?
> Thanks!
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