Reading an 8051

[Alan Barrow]

> 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

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