> I can digout my private note about rotary switch which I figured out at
> that time.  PLS hold on.

http://mail-index.netbsd.org/port-alpha/2001/01/16/0004.html

My unit is labeled PMAGD-BA on the plate with 3D view output port.
It has Bt463 chip on the stacked PCB on top.  There was Bt459 variant
for 8bpp configuration.   It's possible the meaning of rotary switch
position differs each other.

Toru Nishimura/ALKYL Technology