256 vs. 1024 channels Hmmmmmm

Joseph Webster J.Webster at centenary.usyd.edu.AU
Tue Mar 19 23:37:07 EST 2002


Many thanks to all those who showed me the bullet hole in my shoe...

A few days ago I wrote:
> > .... but remember that a 1024-channel data file is four times
> > bigger than the same data in 256 channels.

After a prompt from Mario, I checked this morning and that statement
is wrong!
I remember a factor of four in the (good old?) days of HP computer
and LYSYS II, but had never bothered to check that change in newer
computers.

Testing this morning, my 256-channel file was 72078 bytes while the
same data (test pulses) in 1024-channel was 142078 bytes, or about
double the file size.
Just to confuse matters though, the Mac file system uses 130Kb and
195Kb respectively for the same two files on a 2Gb disk....

Now the accuracy of my memory is quite a different matter... ;~)
Anyone still running a FACScan with LYSIS?

Joseph.




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