I've tried this:
sx=1920:sy=1080 ' screen x/y size' screen open 0,sx,sy,32,lowres palette $000,$FFF,$F00,$0F0,$00F,$0FF,$F0F,$FF0 for x=0 to 8 ink x:bar x*10,10 to x*10+10,100 pen x:print x; next x
and I'm getting black, blue, black, blue, black, blue, black, blue.
Is it because the manifest is in PC mode, or some other setting I need to change, or is the palette command not working yet? It looks like it's just showing the blue channel.