Jorpho wrote:

I'm not sure you're looking in the right spot.

You are right, this window is inside "multimedia" not in "device manager". CD audio worked perfect with the option checked and unchecked. Volume is at 100%.

I found some posts about conventional memory, I added this to config.sys:

1DEVICE=C:\...\EMM386.EXE X=B800-C7FF I=C800-EFFF I=B000-B7FF RAM

This gave me 571 Kb of conventional memory, now Second reality does not complain about memory and i can leave config.sys to load the cdrom and other drivers 😀.