From: nowhere@nospicedham.never.at   
      
   On 12/4/2018 6:47 PM, R.Wieser wrote:   
   ...   
   > [quote]   
   > D9 /6 FNSTENV* m14/28byte Store FPU environment to m14byte or m28byte   
   > without checking for pending unmasked floating-point exceptions. Then mask   
   > all floating-point exceptions.   
   > [/quote]   
      
   > I have abslutily *no* idea how to match it up with the 0x7E opcode folowing   
   > the INT 0x35.    The explanation for the "/6" is as follows:   
      
      
      
   > [quote]   
   > /digit-A digit between 0 and 7 indicates that the ModR/M byte of the   
   > instruction uses   
   > only the r/m (register or memory) operand.   
      
   the /6 in the RM-field (bits 3,4,5) and MOD 00 (bits 6,7) tells that   
   this opcode is FNSTENV   
      
   use_16:   
   D6 30     FNSTENV short [BX+SI]   
   66 D6 30  FNSTENV long  [BX+SI]   
      
   use_32:   
   66 D6 30  FNSTENV short [EAX]   
   D6 30     FNSTENV long  [EAX]   
      
   > The reg field contains the digit   
   > that provides an   
   > extension to the instruction's opcode.   
   > [/quote]   
      
   the reg-field (bits 0,1,2) is used for [mem only] addressing here.   
      
   where do you see an 0x7E "JMP NG" ?   
   __   
   wolfgang   
      
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