EntityColor Color Range

Blitz help for EnityColor says 0-255 is the range for red,green and blue.
If so, why does the range 256-511 continue to increase the amount?

Here is the modified help example

; EntityColor Example
; -------------------

Graphics3D 640,480,24,2

SetBuffer BackBuffer()

camera=CreateCamera()

light=CreateLight()
RotateEntity light,90,0,0

cube=CreateCube()
PositionEntity cube,0,0,5

; Set initial entity color values
red#=255
green#=255
blue#=255

While Not KeyDown( 1 )

; Change red, green, blue values depending on key pressed
If KeyDown( 2 )=True And red#>0 Then red#=red#-1
If KeyDown( 3 )=True And red#<511 Then red#=red#+1       ; <changed 255 to 511
If KeyDown( 4 )=True And green#>0 Then green#=green#-1
If KeyDown( 5 )=True And green#<511 Then green#=green#+1 ; <changed 255 to 511
If KeyDown( 6 )=True And blue#>0 Then blue#=blue#-1
If KeyDown( 7 )=True And blue#<511 Then blue#=blue#+1    ; <changed 255 to 511

; Set entity color using red, green, blue values
EntityColor cube,red#,green#,blue#

TurnEntity cube,0.1,0.1,0.1

RenderWorld

Text 0,0,"Press keys 1-6 to change EntityColor red#,green#,blue# values"
Text 0,20,"Entity Red: "+red#
Text 0,40,"Entity Green: "+green#
Text 0,60,"Entity Blue: "+blue#

Flip

Wend

End

Could others check and see if their computers also show a 0-511 color range.

This is strange !