From: johnl@taugh.com   
      
   According to John Savard  :   
   >Therefore, I came up with the idea of using some opcode space for block   
   >headers which could contain information about the lengths of instructions,   
   >so as to make decoding variable-length instructions fully non-serialized,   
   >thus giving me the best of both worlds.   
      
   Sounds like the first two bits of the opcode in S/360 which tells you the   
   instruction format which also tells you how long the instruction is.   
      
   They've added lots of new instructions since then with somewhat   
   different formats, but those bits still tell you how long the   
   instruction is. The first byte tells you what the fornat is so you   
   know what address calculations to do.   
      
      
   --   
   Regards,   
   John Levine, johnl@taugh.com, Primary Perpetrator of "The Internet for   
   Dummies",   
   Please consider the environment before reading this e-mail. https://jl.ly   
      
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