Conclusion: I have a marginal RH CD-ROM, perhaps a little scratched,
or faulty in some other way, but most CD-ROM readers, perhaps using
their error-correcting capabilities, have no problems reading it.
One single CD-ROM reader however, perhaps old and dusty itself,
times out when reading it, usually after about 100 MB.
As soon as an error occurs Linux crashes - the SCSI subsystem,
perhaps especially the Adaptec 1542 part, is not able to handle
errors.
So, I mounted this CD-ROM on another machine, and then installed
over NFS, and all was fine. (I'll leave the nitpicks to a RedHat
conversation instead of the kernel list.)
Andries