Advice
Andy, download file Laser3.txt from Lib. #4 here; it has a lot of Sony-specific
info that should help, but please note that the driver calls in config.sys were
intended for a Sony-bus, not SCSI, CDROM so you should preserve the SCSI
drivers that you are currently using and not try to add the sony_cdu.sys
described in the file, unless that's what you are already using somehow. The
Mscdex material is all appropriate.