I fixed it. There are two DOS emulators that run on that netbook: pckDOSBOX v0.63 (the one in question) and PocketDOS, in my case v1.2.1. The latter runs Wizardry and other CGA games just fine.
As a result of those two applications and SCUMMVM CE (esp. v1.3.1) that crummy netbook runs a number of fine games, so far about six dozen. In some the sound is a problem- e.g. "Lemmings" and "Oh No! More Lemmings!" as well as Dino Park Builder cannot play the music and with pckDOSBox there is a "double cursor"- and overall performance is not equal to a "real" computer, even the 2001 Sony VAIO, but they work well enough, and some work nearly as well as on the ASUS itself.
So as a low-power offline device the Sylvania netbook has decent value. Those stupid sign-in pages at the local libraries prevent it from going online, apparently they belive that while it is online the whole works for everyone slows down. Fine- then mobile devices must be barred, because surely they slow the mighty ASUS down.