On Thursday 10 May 2012, you wrote: > Having just coded up the VHDL for the CRC computations for both ethernet > and HDLC then I would suspect that the internals of the 6702 are a state > machine that depends upon the value written and the current value. The XOR > operator and logical shifts (left or right) or rotates (left or right) > will also come into the equation. So keep an eye out for these operators > in the numbers that get spat out. As Segher has already hinted - convert > the numbers to hex, octal or binary rather than decimal and you may see > the pattern easier. If we can get a printout of the exact number sequence > on this thread (and the values you poked in to obtain them) this would > allow some degree of 'parallel processing' to the problem. Multiple > hackers working in different time zones all with different ideas working > on a single problem - either a recipe for disaster or success! Cheers, > Dave i'd start with feeding it a pattern that contains the minimum number of 1 bits which will still produce a non zero output (if it produces a non zero output with just zeros as input, even better). that should reveal quickly if it is some kind of lfsr, or something simpler. -- http://www.hitmen-console.org http://magicdisk.untergrund.net http://www.pokefinder.org http://ftp.pokefinder.org Freedom of the press belongs to those who own one. <A. J. Leibling> Message was sent through the cbm-hackers mailing listReceived on 2012-05-11 05:00:04
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