@walkero
Have plenty of Phase 5 accelerators from 1230, 1240, 1260 and BPPC.
Something to take note when using the phase 5 scsi.
The 1230 to 1260 can utilise the MKIV SCSI add-on. To get the best out of the SCSI the highest CPU should be used.
Software wise, make sure you get get hold of and install the Phase 5 SCSI software which can be had from here;
http://phase5.a1k.org/This will allow you to utilise asynchronous and synchronous modes via software.
Also recommend this tool and place it into your startup sequence
http://aminet.net/package/util/misc/MyUnitControlThat way you can implement synchronous and high speed SCSI speeds on startup.