IBM LPFK reverse engineering

[Dave McGuire]

   8051s cannot execute code out of RAM; they are Harvard- 
architecture processors.

         -Dave

On Aug 17, 2008, at 1:00 PM, Scanning wrote:
> Could you execute a small loop in RAM that iterates the flash and  
> pukes the
> code byte by byte onto the serial bus ?
>
> / steven
>
>> Philip Pemberton wrote:
>>> I don't think there's much that can be done with the LPFK without
>>> desoldering the 8051 chip and reading out the program. Catch is, the
>>> chip has probably had its encryption table programmed, and  
>>> probably the
>>> lock bits as well...
>>
>> I was right.
>> The 8051 has both lock bits programmed. Zero activity in program  
>> mode, all
>> outputs Hi-Z.
>>
>> :(
>>
>> Any experienced reverse engineers in the audience, or IBM  
>> collectors with
>> information / drivers / docs for the LPFK?
>>
>> Thanks,
>> --
>> Phil.
>


--
Dave McGuire
Port Charlotte, FL