When I tried to launch an MS-DOS command prompt window in Windows 98 SE, my screen went blank. I could restart my computer by pressing Ctrl+Alt+Del, so the OS didn't freeze.
I didn't notice the issue because I can boot to command prompt without problem. And I guess other modern GPUs may have same issue because 32-bit operating systems are no longer supported.

I can open MS-DOS command prompt window with old integrated Radeon R7 Graphics (Kaveri).

15 hours ago, halohalo said:

my screen went blank

can u check that ur 1660ti is support legacy videos modes (EGA 640x350 and lower)?
look as my problem with 1070....
i partially solved it by patching vdd.vxd, and can boot to 9x gui, run games like Worms, but here remain (other?) problem with opening in MSDOS window... and i can NOT debug it even with softice. :(
 

Edited July 11, 20215 yr by MERCURY127
typos

Try Alt-Enter to check if full screen works.

Or modify the shortcut properties.

 

Also, try to set a hotkey which changes the desktop resolution to another supported one. This way you can blind-type "exit" in the command prompt, then use the hotkey to recover your desktop without restarting.

I tried to compare GeForce GTX 1660 Ti and Radeon R7 Graphics again by running DOS version of Zsnes.

Integrated Radeon R7 supports VESA2. It also supports VGA, SVGA (crashing), and SXGA (supported legacy video modes).

GeForce GTX 1660 Ti can't initialize VESA2. It supports SXGA (HDMI) and QHD (Displayport). I can open MS-DOS command prompt in full-screen mode, but the workaround does not always work.

Are you using VBEMP or the stock VGA.DRV driver?
Try using SVGA driver from Win3.1 in Safe Mode like here: https://msfn.org/board/topic/69569-improving-windows-98-safe-mode

Can you try a different motherboard?

I am using inbox VGA driver.

 

I tried VBEMP and the SVGA driver few years ago. I need to open MS-DOS command prompt window, so VBEMP is not a perfect solution. Unfortunately, the SVGA driver from Windows 3.1 results in graphical glitches because the OS is Traditional Chinese version. If I have different motherboard, maybe I can run the emulator at SVGA mode with Integrated Radeon R7, but it is not my purpose.