This version is sluggish on anything below an 040 NeXTstation/cube (though it runs smoother with a higher amount of memory), and is missing sound, which was added on the PC side. This was the version that the MS-DOS product emerged from, since, at the time, id Software was using a NeXTcube for its graphic-engine development. 5.3.4 Hewlett-Packard 16700 series Logic Analyzers.5.1.1.3 Doomsday Engine and derivatives.