Information in this page updated: 7 Jan 96
The NEC 2xc/NAKAMISHI MBR-7 7disk changer needs a WD 00-08 or it will not work.
CD timeout time ---------------------------------------------------- no CD inserted very long >30sec CD-DA disk long ~20sec XA+RRIP medium ~10sec plain ISO9660 short ~2-5sec
After the controler has 'touched' the drive for the first time you can hit the eject-button, this will speed up things a little. But its annoying. But if you leave the drive empty at power-up the Amiga will take even longer to boot. The V36 scsi.device has a really long time-out, no disk or unbootable/unreadable disks are not detected very well. V37, V40 ROMs boot rather fast and once you have passed the cold boot, next time you reset it comes up very fast.
There is a solution for this: mount all harddrives before the cd-rom drive (i.e. give the cd-rom the highest ID) and use the tool RDBFlags to tell the controller what harddrive is the last one. Beyond this ID the scsi.device will not search. But beware, the tool could do severe damage! Read the manual very carefully!
NOTE: The Toshiba 3401 needs the Sync-Bit in the BattMem cleared if operated under AmigaOS3.1 or higher. The build-in scsi.device pays for the first time attention to this flag and the drive does not like it if synchronous transfer modes are initiated by the controller. The amiga simply locks up during boot. The Toshiba 4101 (and probably all following drives) do not have this kind of problem.
The internal scsi.device of the A600/A1200 and A4000 models do not recognice CD-ROMs. Use the mentioned extensions for this.
Some CD-ROM drives do not like (or do not support) synchronous transfers over the SCSI bus. And since some controllers only allow a global synchron/asynchron selection, this may prevent you from using a fast transfer mode for your harddisk (e.g. Quantum 730S). So please check all of your equipment (e.g. with ProbeSCSI) if it supports synchronous tranfers. Only if all support this, it is save to initiate it.