Phil, those S912's might have been originally intended for use with Salomon skis equipped with the Pilot Edge system.
I have Salomons with both the Pilot Freeride and the Pilot Edge system. The Pilot Freeride plates on my now-mothballed Scrambler 7's provide no ramp, so the S711 bindings that came with these skis came with a ~4mm heel lift spacer that went under the heel to produce a total toe/heel lift differential of ~4mm.
In contrast, the Pilot Edge plates on my Equipe 10 SC's provide a toe/heel lift differential of ~2mm. The S912 Ti bindings did not come with any spacers of any sort, and so the result is a total toe/heel lift differential of ~2mm.
So yeah, some Salomon bindings (at least 2004/2005 vintage) have no inherent ramp.