Vertical Lines and Artifacts

[mmi]

Hi,
When we use our DOS program we are getting alternating vertical lines (black & purple in our display).
When we change screens (page up/down) we also get artifacts left behind from the previous screen if no new data is in those spots.
Any settings to improve this?
Thanks,
Jeff

[Jos]

What program and vDos version causes those display issues?

Jos

[mmi]

It is a CNC mill demo tutorial.
Replicates the machine interface for off-line programming.
easydemo.exe
Servo Products Co. 1994

vDos 2022.05.01 running on
64 Bit Windows 10 Home

[Jos]

Does the program work in VGA graphics mode?

If so, that is only partly supported by vDos and you will be better off with DOSBox or one of its mods.

Jos

[mmi]

ok, thank you