convert ps to b/w

[MaD dUCK <madduck@madduck.net>]

besides the dumb-ness of coining a printer to be black/white - does it
ever print white? -

i have this postscript file which contains color and our laserjet
4050n barfs at those postscript commands, spitting out random
characters that aren't even postscript.

so my question: how can i convert a ps file to black/white only?
using imagemagick's convert, i can't seem to arrive at a result...

thanks,
martin

[greetings from the heart of the sun]# echo madduck@!#:1:s@\@@@.net
-- 
it said "needs windoze 98 or better," so i installed linux.