> Hi,
> With help from Johannes Berg, I've been working on reverse engineering
> the firmware to try and understand the instruction format. Assuming we
> can figure out all of the instructions, the end result is that we'll be
> able to produce an open source firmware.
> So far I've built up a partial understanding of 4 instructions. I have
> produced a home-grown disassembler and a lex+yacc-based assembler. In
> the disassembled format, unrecognised code (i.e. instructions outside of
> the 4 I understand) is stored as blobs of data for now.

Have you thought about trying some well known instruction sets like Intel 
8052 / Atmel AVR ? Even the chip makers that have their own instruction sets 
seem to make 8052 based chips as well. I think the Intel 8052 instruction set 
would be your best bet, since 8052 based micro controllers just seem the most 
widely used.

Or did someone at Zydas actually tell you that their chips use some custom 
micro controller ?

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