Many many thanks for explanation :) Best, Carlo >----Messaggio originale---- >Da: email@example.com >Data: 26/07/2010 19.12 >A: <firstname.lastname@example.org> >Ogg: Re: CSG 4510 and 4567 and Dmagic reverse engineering > >Hi, > >Nate is quite correct, for the most part, but let me add my $0.02 worth... > >Old chips were designed by engineers laying out "micro-circuits" much as >you'd lay out a full printed-circuit board. Hardware-description langauges >(HDLs) like Verilog weren't used for that back then (despite being invented >in the 80's). > >Newer programmable devices, such as CPLDs, FPGAs and ASICs can be programmed >using HDLs like Verilog or VHDL. However, just like you can't rip the C >source from an executable, you can't rip the Verilog source from even these >programmable devices. > >A reasonable number of older devices have been *emulated* in HDLs in recent >years, mainly by studying the datasheets - often there is enough information >in the chip data to allow a full emulation without any reverse-engineering >required. Such devices include 8- and 16-bit CPUs, support chips such as >sound, PIAs, video etc. Even whole computers - including the C64 & Amiga 500 >- have been emulated in HDLs on a single programmable chip. > >For chips that don't have any data, or insufficient data, "decapping" is >what Nate is describing, and the techniques are only now being refined. >Usually decapping is required for protected CPUs with hidden ROMs, for >example, as you'd find in certain arcade games. But it requires expensive >equipment and a lot of knowledge about how chips are put together - not for >the home hobbyist. > >Regards, > >-- >| Mark McDougall | "Electrical Engineers do it >| <http://members.iinet.net.au/~msmcdoug> | with less resistance!" > > Message was sent through the cbm-hackers mailing list > Message was sent through the cbm-hackers mailing listReceived on 2010-07-26 21:00:03
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