Does that mean the pb540c does 32768 colors and NetBSD is reporting it
wrongly as 65536 colors?

Daniel R. Killoran,Ph.D. wrote:
> 
> >I know I'm not telling most of you anything new but FWIW this is 16 bit
> >colour, e.g. 2^16 = 65536.  32768 is 15 bit e.g. 2^15.  16bit is a
> >supported resolution, 15 bit is not, in the monitors control panel.  In
> 
> Umm, well actually on the Mac 16-bit colour is actually 15-bit colour. You
> have 3 colours, and 3 doesn't go into 16, so they pack 3 5-bit values into
> a 16-bit word & don't use the upper bit.
> 
> Dan Killoran
> 
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