When I execute Bob's code on my Mac 7600/132 (132 MHz PPC 604)
Squeak 2.8a-1919 I get the following:

MacOS Setting, (Millions Colors) (832x624)
32   80  80  81  80 
16   101  101  101  102 
8   102  102  103  105 
4   99  99  99  98
1   96  96  95  96

MacOS Setting, (Thousands Colors) (832x624)
32   98  97  97  97 
16   41  41  41  41 
8   80  80  80  81 
4   75  75  75  74 
1   70  70  70  71

MacOS Setting, (256 Colors) (832x624)
32   99  100  100  100 
16   94  95  95  95 
8   64  64  64  64 
4   60  62  60  59 
1   56  56  56  56

    Ken

At 3:04 PM -0500 on 3/22/00,  Jarvis, Robert P. \(Contingent is 
rumored to have written:

><>
>Code to produce the above (minus the comments on depth of physical screen):
>
>#(32 16 8 4 1) do: [ :bitDepth |
>	(Display supportsDisplayDepth: bitDepth) ifTrue: [
>		Display newDepth: bitDepth.
>		Transcript show: bitDepth printString; show: '   '.
>		4 timesRepeat: [
>			Transcript
>				show: ([ Display forceToScreen: (1 at 1 extent:
>Display extent) ] timeToRun) printString;
>				show: '  ' ].
>				Transcript cr ] ].
>Display newDepth: 16.
>
>Bob Jarvis
>Compuware @ Timken