The DTL-H500, codename MW.3, is the earliest development hardware with final PlayStation silicon and appeared in late Spring 1994.  Most of these target boxes lacked sound hardware (or libraries to make use of it) and there was no CD drive (it utilized an external CD-emulator).  Sony's next move was to consolidate the target box to a standard PC platform by way of two ISA cards (DTL-H2000) and develop an external CD-ROM drive (DTL-H2010).