I did some research and tried to remember how to do it.
In the last link we find really many files, some have a list of what they contain, I seem to have seen a Mozart DOS driver.
Then I found other things, instructions where they explain how to install a CD-ROM by connecting it to the Audio Card.
Obviously there are various models of Mozart Audio Cards, the difference is the chipset (Opti for example), that's why I asked if you know the model or a photo.
However in the instructions I have I connect a Philips CD-ROM to the Audio tab.
He says:
1) copy the DDATAPI.SYS file to the HD
2) Insert in CONFIG.SYS a line like this:
DEVICE=C:\DDATAPI.SYS /D:MSCD001 /P:220 /V
The 220 I put it, it can change, it depends on the setup.
then it says to delete the line of the Mozart CD-ROM device (DEVICE = CD17I0.SYS etc.), inserted in the CONFIG.SYS and put that of the DDATAPI.SYS
3) Insert a line similar to the following in the AUTOEXEC.BAT file:
C:\DOS\MSCDEX /D:MSCD001
where /D:\MSCD001 must be the same in Config.sys and in Autoexec.bat
I believe the DDATAPI.SYS file is able to make your CD-ROM work.
I will however try to restart one of my OLD-PCs, maybe if I am lucky I recover the CDSETUP.SYS file and try to put the link here.
AMD 286-16 287-10 4MB HD 45MB VGA 256KB
AMD 386DX-40 Intel 387 8MB HD 81MB VGA 256KB
Cyrix 486DLC-40 IIT387-40 8MB VGA 512KB
AMD 5X86-133 16MB VGA VLB CL5428 2MB and many others
AMD K62+ 550 SOYO 5EMA+ and many others
AST Pentium Pro 200 MHz L2 256KB