Clarifications on last Programming 101

[Mike Dillon]

Hey Tony,

 Let me expand on your answer a little so the binarily inpaired can 
 understand :)

 FD (Hex) is 1111 1101 in binary. This means from what Bruce has discovered 
       this bit ^  at address 050D controls the vss diagnostic.
 F9 (hex) =  1111 1001 and
    this bit ^  is the knock diagnostic ie 0111 1001 = 79 hex
 39 (hex) = 0011 1001
    this bit  ^  is the egr diagnostic ie 0001 1001 = 19 hex

  My hat is off to Bruce (How in the heck did you find this ??) 

The question is does clearing these bit(s) disable these functions or
does it just turn off the error reporting ??

Mike D. 

 from what Bruce has found   
> From diy_efi-owner at esl.eng.ohio-state.edu Fri May  1 06:22 CDT 1998
> From: Tony Cooper <tony.cooper at virgin.net>
> 
> Bruce - Please excuse me if you already understand this, but the numbers
> shown below are bit fields within bytes.
> 
> Sorry if I am typin the bleedin obvious on this one.
> TTFN
> Tony
> 
> Bruce Plecan wrote:
> 
> > Again please read all prior 101 text before trying to interupt this
> > as a complete thought.
> >
> > I'm going to give a few examples of what a set of malfunction
> > code flags look like and how they change in a given application.
> >
> > If we were to look a 747 bin file with a hex editor, we might see
> >
> > 050D     050E     050F
> >   FD         39          F9    would be stock
> >   FC         39          F9   would be no vss diagnostics (code 24)
> >   FD         39          79   would be no knock (code 43)
> >   FD         19          F9   would be no egr (code 32)
> > I hope this shines a tad more light on the issue.  Also note
> > how unique the pattern seems against all the other table
> > stuff.
> >
> > Also, an address might better discribe 16 bytes, and an
> > address of say 0000+0001, rather than a location of say
> > 0000..
> >
> > Cheers
> > Bruce       We need a Cone Shaped Hat representative in
> >                  washington, DC by the year 2000.  If I start
> >                  walking now I might make it in time..
> 
> 
> 
> --
> Sent By Tony Cooper.
> email: tony.cooper at virgin.net
> Allow at least 10 working minutes for reply. ;)
> 
> 
> 
> 
> 
>