[time-nuts] FE-5680A firmware dump

[Azelio Boriani]

OK, then maybe there are ROM bank switching as the MCS51 can't execute
beyon the 64K limit. It can be very challenging to follow a code that jumps
between 64K ROM banks. Moreover the MCS51 has to address the external RAM
by massive pointer use (the famous MOVX @DPTR,A and MOVX A, at DPTR
instructions) beyond the 256byte internal easier to address RAM. Yes, you
need a good disassembler, aware of bank switching and massive pointer use.

On Fri, Feb 17, 2012 at 11:20 AM, Javier Herrero <jherrero at hvsistemas.es>wrote:

> Don forget the PSD813 :) It provides 128KB Flash and 8KB RAM... so it can
> be a bit more complicated
>
> Regards,
>
> Javier
>
> El 17/02/2012 11:09, Azelio Boriani escribió:
>
>> In my opinion you don't need the power of an IDA-class disassembler to
>> process an 8051-like code. The MCS51 family processors have only 128 or
>> 256
>> bytes of RAM (and at most 64K ROM) and cannot host complex code.
>>
>> On Fri, Feb 17, 2012 at 10:27 AM, Elio Corbolante<eliocor at gmail.com>
>>  wrote:
>>
>>  From: Mike McCauley
>>>
>>>> I've been considering ripping the firmware from the mcu as well.  I've
>>>>>>
>>>>> not
>>>
>>>> got beyond the consideration stages, but i have all the equipment here
>>>>>>
>>>>> at
>>>
>>>> work. When you say that the read option is not available. is this
>>>>>>
>>>>> because
>>>
>>>> the chip has protection fuses enabled?
>>>>>>
>>>>> Id like to help with the disassembly if you can get the binary dump.
>>>>
>>>
>>> Don't worry: when I will be able to dump the firmware I will let it on
>>> the
>>> public domain.
>>> BTW, I have the opportunity to use the IDA disassembler (a friend of mine
>>> is a licensed user) so I think the disassembly of the code will be rather
>>> good.
>>> Any knowledge of a public domain 8051 disassembler which can rival IDA in
>>> performance/code analysis?
>>>
>>> _     Elio.
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