Update: From the source. It aired on More Gadgets on Tuesday, September 13 at 7:00pm ET. You can purchase the DVD for $25 or wait for it to show up On Demand cable if you have it.
In via Ben Vehorn on AH. Title link takes you to History Channel's Modern Marvels page, but I couldn't find the piece. Maybe it hasn't made the site yet? Will need to keep an eye out on it.
Ben Via AH:
"The show "Modern Marvels" on the History Channel just did a piece on
the history of drum machines. Though it wasn't ridiculously in-depth
(8-10 minutes), it was pretty accurate and cool to see. They started
with metronomes, then showed a Wurlitzer drum machine (I think it was a
Sideman), then went into the home organs and analog drum machines (Korg
55, TR-808). They talked about how sampling changed everything and had
some guy demo-ing a Linn 9000 (though no LM-2, which seemed an
oversight), then went into V-drums and grooveboxes."