Order Tray | Contact Us | Home | SIG Lists

[aprssig] A funny packet story/joke (The KISS guys will get it)

Jason Winningham jdw at eng.uah.edu
Thu Nov 10 20:13:01 UTC 2005


On Nov 10, 2005, at 2:03 PM, Zeff_Wheelock at harvardpilgrim.org wrote:

> Not to split hairs or anything:
>
>> Switching to 64 bit memory addresses will thus provide 4.2 billion 
>> times 4.2 billion distinct
> locations.
>
> The actual math should be 4.2 billion x 4.2 billion + (4.2 billion x 
> 4.2 billion).
>
> If I was to go from 6 bit to 12 bit, 6 bit would be 32, 12 bit is 2048.
> 32x32= 1024, so you are missing by 1024.  So the math would be 
> 32x32+(32x32) to get the answer.

Sorry, but this is _completely_ wrong. The original poster was correct.

exponents add when you multiply. 2^32 * 2^ 32 = 2^(32+32) = 2^64

32 * 32 + 32 * 32 is nonsense.

12 bits give you 4096 unique values, not 2048.

-Jason
kg4wsv





More information about the aprssig mailing list