A2090 needs a driver in the Expansion drawer of SYS: so does the A2091 with autoboot disabled.
IDEfix can be used i think, if you change the device to scsi.device or whatever.
Cant really remember it`s been so long.
Also, with a 2091, your amiga wont boot without a CD in the drive. Annoying as hell. Never found a way round it.
