[vcf-midatlantic] Monochrome and VGA together?

Richard Cini rich.cini at gmail.com
Mon May 13 20:02:36 EDT 2019

All --

	I dug around in my shop and I found an old IBM 5151 monochrome green screen monitor. Not sure why I didn't remember it, but on the train tonight that neuron fired and I went looking for it when I got home. So, I connected everything (Video7 VGA/EGA card and the generic monochrome card) and it worked! Yay!

Thanks again all!

Rich Cini

On 5/13/19, 9:25 AM, "Jim Scheef" <js at sdf.org> wrote:

    Many VGA adapters have very large ROMs and map into memory space above 1M. The old part of the ROM that 'counts' is what is found during POST. Install one adapter at a time and map the memory space using one of those utilities that help to optimize DOS memory space. Once you know where each adapter maps its ROM, you might find two that can coexist.
    -----Original Message-----
    From: vcf-midatlantic <vcf-midatlantic-bounces at lists.vcfed.org> On Behalf Of Richard Cini via vcf-midatlantic
    Sent: Sunday, May 12, 2019 3:48 PM
    To: Dean Notarnicola <dnotarnicola at gmail.com>; vcf-midatlantic <vcf-midatlantic at lists.vcfed.org>
    Cc: Richard Cini <rich.cini at gmail.com>
    Subject: Re: [vcf-midatlantic] Monochrome and VGA together?
    Ok, good. I think I have to downgrade my video card from VGA to EGA because the VGA ROM is 32k not 16k. Good thing I have a few of those too :-)
    Rich Cini
    On 5/12/19, 3:25 PM, "Dean Notarnicola" <dnotarnicola at gmail.com> wrote:
    It was possible and common for CAD and software debugging scenarios. I know MDA and CGA worked together; not positive about EGA. Should be ok as long as there's no memory address or IRQ conflicts. 
    On Sun, May 12, 2019 at 3:22 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?
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