Commander Keen uses EGA graphics with double-buffering (two video pages, "dual-page mode").
Here's another program using it, albeit in 640x350 resolution.
https://www.youtube.com/watch?v=M2q5r3aNIyA

Hm. There's an old version of Virtual PC for Windows 98.
Maybe you can find it on eBay etc. It simulates an S3 VGA and dual-OPL2 (partially broken? Adlib/OPL2 ok), afaik.
That way, you can run MS-DOS 6.2x or Novell DOS 7 in a window.. Without leaving Windows 98SE. 😉

Hm. Or just use DOS for DOS games. Use MS-DOS Shell or Norton Commander, if the plain C:\> prompt is too crude.
Windows never was good with DOS applications, I think..

Jo22 wrote on 2023-01-23, 02:48:

Windows never was good with DOS applications, I think..

This is kind of a misconception, while there are DOS applications with issues within Windows 9x, most of them works fine including the Commander Keen series. Seems to me that the problem is with the video card driver.

Only the NT-based versions of Windows weren't truly good with DOS applications.

Gmlb256 wrote on 2023-01-23, 03:37:

This is kind of a misconception, while there are DOS applications with issues within Windows 9x, most of them works fine includ […]
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Jo22 wrote on 2023-01-23, 02:48:

Windows never was good with DOS applications, I think..

This is kind of a misconception, while there are DOS applications with issues within Windows 9x,
most of them works fine including the Commander Keen series. Seems to me that the problem is with the video card driver.

Only the NT-based versions of Windows weren't truly good with DOS applications.

It may be an misconception, but it's MY misconception then. And it matches my personal experierence, too. 😁
Back in the days before Windows XP I had nothing but trouble with Windows 3.x/9x and DOS applications (together, I mean).

DOS-based Windows messed up so many things. The serial port timings, the PIT, the waiting/idle loops in DOS programs, the video memory.
OS/2 Warp was much better here. It could emulate a generic VGA BIOS or use the real VGA BIOS on the ROM chip, for example. 😎 👍

Edit: Silly me! It's not DOS applications. It's "Non-Windows Applications" in Windows terminology. 😉

Do you know how to solve it? Just do alt+tab to return to Windows and then reopen the DOS window from the taskbar. Mystery 😅

Jo22 wrote on 2023-01-23, 05:58:

DOS-based Windows messed up so many things. The serial port timings, the PIT, the waiting/idle loops in DOS programs, the video memory.

Yes, this is especially with Windows versions prior 9x where many of these issues originated.

At least Windows 9x made several improvements and even has some overlooked capabilities for DOS programs within the Windows environment such as being able to use DirectSound (DirectX) in Impulse Tracker.

matti157 wrote on 2023-01-23, 08:06:

Do you know how to solve it? Just do alt+tab to return to Windows and then reopen the DOS window from the taskbar. Mystery 😅

With the current video card, no. 🙁

If possible, try with a period correct one since the Quadro FX 3450 was made by the time DOS went out of mainstream support.

No but as a solution I am perfectly fine with it, it was a rhetorical question.
For now with the 3450 everything works fine and I have Windows 98 + DOS on a native HDMI port 😁

Gmlb256 wrote on 2023-01-23, 13:02:

Jo22 wrote on 2023-01-23, 05:58:

DOS-based Windows messed up so many things. The serial port timings, the PIT, the waiting/idle loops in DOS programs, the video memory.

Yes, this is especially with Windows versions prior 9x where many of these issues originated.

At least Windows 9x made several improvements and even has some overlooked capabilities for DOS programs within the Windows environment such as being able to use DirectSound (DirectX) in Impulse Tracker.

I think you're right here, good point! 🙂👍

What I was thinking of were Real-Mode applications, mainly.
And applications that struggle with DPMI-enabled OSes.
Essentially all those applications which don't feel well with EMM386/QEMM/386Max being around (those memory managers are akin to little V86 OSes).