Digital UNIX V3.2C through V4.0D do not support the KZPCA wide SCSI controller on the emulated AlphaServer 400 and are limited to the KZPAA controller's seven guest targets. V4.0E has not been qualified for KZPCA. The supported KZPCA matrix starts at V4.0F.

Runtime testing establishes KZPCA boot and storage I/O at Digital UNIX V4.0F.