maple classic™ 
so the way the ntsc ps1 was transcoded into pal-m was they tacked on a pal-m subcarrier crystal across the original ntsc one and wired one bit on the video encoder IC to ground to switch it over
you just remove the crystal and the patch wire and it goes back to ntsc, and displays correctly on american tvs (or, in this case, a PVM)
i guess they don't remove the original ntsc crystal in this console because the original is SMD
in older consoles (SNES, Master System f.ex) the crystal is through-hole, so they would remove the original NTSC one and put a PAL-M in its place, making it harder to revert those since then you need to source the original crystals again