Eliot Miranda uploaded a new version of System to project The Trunk:
http://source.squeak.org/trunk/System-eem.801.mcz

==================== Summary ====================

Name: System-eem.801
Author: eem
Time: 20 February 2016, 11:40:02.089874 pm
UUID: cb00963a-1c90-40c0-9539-04c88c0afa5f
Ancestors: System-mt.800

In Spur calcEndianness can be a lot simpler.

=============== Diff against System-mt.800 ===============

Item was changed:
  ----- Method: SmalltalkImage>>calcEndianness (in category 'system attributes') -----
  calcEndianness
- 	| bytes word blt |
  	"What endian-ness is the current hardware?  The String '1234' will be stored into a machine word.  On BigEndian machines (the Mac), $1 will be the high byte if the word.  On LittleEndian machines (the PC), $4 will be the high byte."
  	"Smalltalk endianness"
+ 	| wordThenBytes |
+ 	wordThenBytes := WordArray with: 16r01020304.
+ 	ByteArray adoptInstance: wordThenBytes.
+ 	wordThenBytes first = 1 ifTrue: [^#big].
+ 	wordThenBytes first = 4 ifTrue: [^#little].
+ 	self error: 'The author is confused'!
- 
- 	bytes := ByteArray withAll: #(0 0 0 0).  "(1 2 3 4) or (4 3 2 1)"
- 	word := WordArray with: 16r01020304.
- 	blt := (BitBlt toForm: (Form new hackBits: bytes)) 
- 				sourceForm: (Form new hackBits: word).
- 	blt combinationRule: Form over.  "store"
- 	blt sourceY: 0; destY: 0; height: 1; width: 4.
- 	blt sourceX: 0; destX: 0.
- 	blt copyBits.  "paste the word into the bytes"
- 	bytes first = 1 ifTrue: [^ #big].
- 	bytes first = 4 ifTrue: [^ #little].
- 	self error: 'Ted is confused'.!