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! Get Outlook for iOS<https://aka.ms/o0ukef>
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@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!
Get Outlook for iOS<https://aka.ms/o0ukef>
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 -- Rich Cini http://www.classiccmp.org/cini http://www.classiccmp.org/altair32 On 5/12/19, 3:25 PM, "Dean Notarnicola" <dnotarnicola@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@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! Get Outlook for iOS<https://aka.ms/o0ukef>
Rich, 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. Jim -----Original Message----- From: vcf-midatlantic <vcf-midatlantic-bounces@lists.vcfed.org> On Behalf Of Richard Cini via vcf-midatlantic Sent: Sunday, May 12, 2019 3:48 PM To: Dean Notarnicola <dnotarnicola@gmail.com>; vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> Cc: Richard Cini <rich.cini@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 -- Rich Cini http://www.classiccmp.org/cini http://www.classiccmp.org/altair32 On 5/12/19, 3:25 PM, "Dean Notarnicola" <dnotarnicola@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@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! Get Outlook for iOS<https://aka.ms/o0ukef>
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 -- Rich Cini http://www.classiccmp.org/cini http://www.classiccmp.org/altair32 On 5/13/19, 9:25 AM, "Jim Scheef" <js@sdf.org> wrote: Rich, 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. Jim -----Original Message----- From: vcf-midatlantic <vcf-midatlantic-bounces@lists.vcfed.org> On Behalf Of Richard Cini via vcf-midatlantic Sent: Sunday, May 12, 2019 3:48 PM To: Dean Notarnicola <dnotarnicola@gmail.com>; vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> Cc: Richard Cini <rich.cini@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 -- Rich Cini http://www.classiccmp.org/cini http://www.classiccmp.org/altair32 On 5/12/19, 3:25 PM, "Dean Notarnicola" <dnotarnicola@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@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! Get Outlook for iOS<https://aka.ms/o0ukef>
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. Best, Thomas F.
On May 12, 2019, at 3:21 PM, Richard Cini via vcf-midatlantic <vcf-midatlantic@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!
Get Outlook for iOS<https://aka.ms/o0ukef>
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. Rich Get Outlook for iOS<https://aka.ms/o0ukef> ________________________________ From: vcf-midatlantic <vcf-midatlantic-bounces@lists.vcfed.org> on behalf of Thomas Fuchs via vcf-midatlantic <vcf-midatlantic@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. Best, Thomas F.
On May 12, 2019, at 3:21 PM, Richard Cini via vcf-midatlantic <vcf-midatlantic@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!
Get Outlook for iOS<https://aka.ms/o0ukef>
participants (5)
-
Dean Notarnicola -
Douglas Crawford -
Jim Scheef -
Richard Cini -
Thomas Fuchs