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 (Draft Status)
 
-# Letter regarding ISAMUX / NS      
-      
-This is a quick overview of the changes that we are proposing to the PowerPC     
-instruction set.    
-     
+# Letter regarding ISAMUX / NS
+
+This is a quick overview of the changes that we are proposing to the PowerPC  
+instruction set. 
+  
 ## Overview  
-      
+
 The PowerPC Instruction Set Architecture (ISA) is an abstract model of a 
 computer. This is what programmers use when they write programs for the machine,
 even if indirectly via a compiler for a high level language. We must be  
 conservative in how we add to the ISA to:  
-     
-* not break existing programs           
-     
-* be mindful as to how others may wish to add to the ISA in the future   
-     
-This document describes our strategy.       
-     
-     
+  
+* not break existing programs   
+* be mindful as to how others may wish to add to the ISA in the future
+  
+This document describes our strategy. 
+  
+  
 ## ISA modes and escape sequences  
-     
+  
 New chips usually need to be able to run older (legacy) software that is  
 incompatible with the latest and greatest ISA. Eg: 64 bit chip must be able to  
-run older 16 bit and 32 bit software.      
-     
+run older 16 bit and 32 bit software.
+  
 To enable backwards compatability the CPU will be set into 'legacy' mode. This  
-is done with an ISA Mode switch, also known as ISA Muxing or ISA Namespaces.    
-      
-The operating system is able to quickly change between 'modern' ISA mode and    
-various legacy modes.       
-     
-Another technique is an ISA escape-sequence. This is a type of mode that is     
-only operational for a short time, unlike 32 or 64 bit which would be for the   
-entire run of a program.    
-      
-     
-## What are we adding to the ISA   
-     
-When high quality graphical display were developed the CPUs at the time were    
+is done with an ISA Mode switch, also known as ISA Muxing or ISA Namespaces. 
+
+The operating system is able to quickly change between 'modern' ISA mode and 
+various legacy modes. 
+  
+Another technique is an ISA escape-sequence. This is a type of mode that is  
+only operational for a short time, unlike 32 or 64 bit which would be for the
+entire run of a program. 
+
+  
+## What are we adding to the ISA
+  
+When high quality graphical display were developed the CPUs at the time were 
 shown to not be able to run the display fast enough. The solution was the use of 
-Graphics cards, these are specialised computers that are good at rendering      
-pixels; often by doing the same thing in different parts of the screen at the   
+Graphics cards, these are specialised computers that are good at rendering
+pixels; often by doing the same thing in different parts of the screen at the
 same time (in parallel). These specialised computers are called Graphical
-Processing Units (GPUs).    
-     
-The parallelism of some GPUs is thousands. This has led to GPUs being used to   
-solve non graphical problems where high parallelism is useful.   
-     
+Processing Units (GPUs). 
+  
+The parallelism of some GPUs is thousands. This has led to GPUs being used to
+solve non graphical problems where high parallelism is useful.
+  
 **break**
 
 # Letter regarding ISAMUX / NS