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Setup & Installation / Re: And it works! DOS and WINOS2 on Thinkpad X 250!
« on: September 29, 2019, 08:56:20 pm »
Right click on the session icon -> Properties, click on the 'Session' tab -> Properties, choose 'All DOS settings' and scroll down to 'DOS_UMB' and click the 'Off' button. In CONFIG.SYS the default values are set on the DOS=LOW, NOUMB line. If you ever changed that for some reason (like I did) to DOS=HIGH, UMB then DOS/Win sessions will default to using DOS_UMB=On unless you go to the properties page of each session and explicitly change it there. So it's a good idea to check for that if you are having trouble with DOS/Win sessions...
