Changes
/* Vortex -S and -D Drives (720K/disk) */
TO BE CONFIRMED: Does the interface fully decode US0/US1 from NEC765 and if you select unit 3 which drive is accessed.
TO BE CONFIRMED: The motors of each drive can be controlled individually. How is this done?
TO BE CONFIRMED: These interfaces use different ports to CPC6128?
== Vortex -Z Drives (180K/side or 180K/disk?) ==
