Well, I am back online with the CD again. Installed it all from the latest SquirrelSCSI disk and it worked fine.
Though, it worked fine in the meaning "working". Still everything runs in slowmotion. The 060-version does not work... at startup the screen turns grey and after 30 seconds or so it all crasches. The "new" version from '97 crasches instantly.
The installdisk I downloaded was version 1.12. Previously I had 1.10. Not sitting by the computer so I can't look up the versionnumbers of the files at the moment, though.
Oh, well, just some more weeks and I'll be using a regular IDE/atapi CD-Rom through the SCSI Kit IV... I won't be bothering about this very issue anymore. Everything I needed to install from CD I have installed by now (it took about 4 hours to install Wasted Dreams, some 500mb I think it was... I mean, even at 2x speed it shouldn't take more than an hour... not with SFS, not with SquirrelSCSI... not at all...).
Thanks for all of your help, though!