![](/static/253f0d9b/assets/icons/icon-96x96.png)
![](https://lemmy.world/pictrs/image/a8207a32-daa2-4b31-aab4-2d684fc94d18.png)
I built a config.sys file with a menu that then passed the menu choice on to autoexec.bat so I could choose at boot time between 3 configurations- one with expanded memory for older games that required it, one with extended memory for everyday use and newer games, and one with everything extra (including CD-ROM drivers) stripped away to maximize free conventional RAM for the one or two games that needed that…
I don’t remember at this point… So I googled, this looks familiar: http://smallvoid.com/article/dos-multiple-configurations.html