Re: Colossus deciphering

Well done Tony - a superb achievement.


Regards

Graham Ellsbury



> -----Original Message-----
> From: Bletchley Park discussion
> [mailto:BLETCHLEYPARK-0lvw86wZMd/[email protected]]On Behalf Of Tony Sale
> Sent: 18 October 2005 16:47
> To: BLETCHLEYPARK-0lvw86wZMd/[email protected]
> Subject: [BPARK] Colossus deciphering
> 
> 
> All, just to give a bit of a lift at these gloomy times:
> 
> I have now got the Psi wheel thyratron rings working on Colossus and
> have used single character spanning to decipher the first four
> characters of a cipher text.
> 
> On the Q bus you put bit 1 into counter 1, bit 2 into counter 2 etc. The
> counters then show 0 or 1 if they count a resultant bit, thus reading
> down the units count of the counters shows the bit pattern of the
> character on the Q bus selected by spanning.
> By switching Z + K + S onto the Q bus the result is P the plain language
> character and it works!!
> 
> Now have to get Motoring working to decipher further down the tape.
> 
> The Colossus operators deciphered the first 10 or 20 characters this way
> to check on correct settings of all wheels.
> regards-- 
> Tony Sale
>