Did someone ever seen the DTL-S for the Sound Artist Tool (700 or 800)? I also dont find the ProDG Software for PS1.
They may say you should only use it for arcade games, because you are guaranteed to be running on hardware that supports it. To be released for a console the game has to run on all hardware. Only the early playstations don't support it, I have one scph1002 that does and one that doesn't. It does seem strange that it's only supported in libgs & it doesn't even fall back to polygons if the hardware doesn't support it. When you flip, the starting u & v have to be on the other size of the texture. You have to have the correct alignment or the texture will be corrupted.
On the earliest version of the home console Playstation unit, they used dual port DRAM for the frame buffer. The frame buffer on that board were a 160 pins part. At a later time (some time around the end of 1995) they switched to a 208 pin part which used a single SGRAM chip as video memory. Is this the cause for that function missing issue ?