8-bit memories and covert exfiltration
It spent a lot of its life w/ the top off (tipped sideways) to get at its glorious internals, where it was integrated to various hackeries of my early teen mind, the pièce de résistance being an integration to the Radio Shack Mobile Armatron (below).
Now, one of the key debugging techniques I used to use (other than the common ‘debug print’) was an AM radio. Yes you heard that right. It turns out that you could construct ‘spin’ loops that would make tones on a nearby AM radio, and you could use those to figure out where your code was (this predates debuggers, I had no printer, nothing else with a serial port, etc). This predates me having a modem, but it was the same sort of glorious 8-bit noise. Lots of distortion and static, but glorious.
Fast forward in my career a three decades, and the AM radio is no longer commonly used. Or is it?
You see, this technique can still be useful. First, lets talk about Van Eck Phreaking. Its like science fiction, but in fact was what I was using in the very early 80’s. You see, people can ‘sniff’ the inadvertent radio emissions of nearby devices. You can use it to figure out keystrokes, even what is showing on a monitor. Here’s a bit of an example, through 2 walls, someone viewed a monitor.