[rescue] A Question about Snap Servers

[Lionel Peterson]

> From: "Carl R. Friend" <crfriend at rcn.com>
> Date: 2004/08/05 Thu PM 12:29:37 GMT
> To: The Rescue List <rescue at sunhelp.org>
> Subject: Re: [rescue] A Question about Snap Servers
> 
>    On Tue, 3 Aug 2004, Steve Sandau wrote:
> 
> > > Well, sure, but I was able to notice patterns, which caused me
> > > to find out someone was trying to hack into my box scanning ports
> > > (it went "bzzzt, pause, bzzzt, pause, bzzzt, pause..." for a long
> > > time. ;^)
> > 
> > Pretty cool. That is just the kind of thing I thought would be
> > helpful.  I didn't realize it might be so easy to do that.
> 
>    That's really the same thing as using a plain old AM radio as a
> troubleshooting aid with certain types of (really) old iron.  You'd
> be amazed how much the resulting audio can tell you (machine in tight
> loop, performing heavy calculation, even where in memory a program
> might be hitting (if you can get the antenna close enough)).  Certain
> diagnostics sound distinctive enough that one can identify what's
> being tested at any given instant just by listening.

In the early TRS-80 days, placing a "flavoradio" (a $6 AM radio) on the logo on the keyboard/system unit (Model I TRS-80) and clever programming could make "music" - I seem to recall there were actual programs to exploit this phenomenon...