From: mutazilah@nospicedham.gmail.com   
      
   On Monday, November 21, 2022 at 11:37:26 PM UTC+8, wolfgang kern wrote:   
   > On 19/11/2022 20:09, Paul Edwards wrote:   
   > > I have implemented TF (trap flag) for the 8086.   
   > >   
   > > But when I looked up RBIL, it doesn't say that TF   
   > > also works for the 80386. INT 1 is complicated   
   > > instead.   
   > >   
   > > So can I single-step an 80386 program?   
   > >   
   > > It looks like x'cc' still works on an 80386, invoking   
   > > INT 3 (from my reading of RBIL).   
   > >   
   > > Anyone know for sure?   
      
   > yes, CC work on all x86.   
   > but any decent debugger use Traps instead:   
   > a) by setting TF to single step one instruction w/o   
   > the need for replace/insert a byte there.   
   > b) by setting breakpoints [DATA or CODE or I/O] to   
   > trap at occurrence (reason for debug-registers).   
   > note: CC work different to the avoidable CD03.   
      
   Ok, thanks for that information.   
      
   I am interested in restricting myself to the same tools   
   that Tim Paterson had when creating the precursor   
   to MSDOS, with the difference that I am   
   doing 32-bit C programming instead of 16-bit   
   assembler programming, so when I debug at the   
   assembler level, it is almost all generated code.   
      
   BFN. Paul.   
      
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