Reading an 8051

[944Technologist]

Alan,

The BOSCH ML3.1 is used in mid/late 80s Porsche 911 and 944. Also some BMW.

The factory has a semi -secret Test Mode for the 8051. They have to have a
way to verify their parts before shipping. Anyone know how to trigger this
test mode?

FR Wilk
__________________________________________


> > I am trying to read a BOSCH ML3.1 code from an 8051. I am using an EMP10
> and
> > tried using an 8751 as the programmed device (the EPROM version of the
> > 8051). I am getting repeatable reads but it appears to be garbage. The
> 8051
> > is from 1985 and should precede any safeguards against reading the
> internal
> > ROM.
>
> The 8751 is the eprom version of the 8051. You should be able to read it
> using that setting unless they set the security mode. I would need to
check
> to be sure, but I think the mask programed 8051 has a setting to prevent
> reading the eprom if selected even further back than '85.
>
> Most of my work was with 8031 "ROM'less" versions, or with the older '48
> series, so I never used a real 8751. Burned my share of 8748's, however!
>
> I'm curious which application the ML3.1 is for?
>
> Thanks,
>
> Alan

----- End of forwarded message from owner-diy_efi at diy-efi.org -----
----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org