This article is from the CD-Recordable FAQ, by Andy McFadden (firstname.lastname@example.org) with numerous contributions by others.
CDM240J (4x2/512K;SCSI, based on the JVC XR-W2010)
CDM400 (4x4/512K;SCSI, based on the Yamaha CDR-100)
CDE260R (6x2x2/1MB;SCSI, based on the Ricoh 6200S)
[ DynaTek reportedly went out of business. However, the UK site seems
to be alive and well. ]
Older CDM240 units were based on the Yamaha CDR-102. Since the Yamaha
CDR-100 is no longer being made, chances are the CDM400 is now a different
unit as well.
They also sell the CDM4000, which is a stand-alone CD burner.