via this auction
Pics of the inside below.
"For your consideration is this vintage 1981 Linn LM-1 Drum Computer drum machine. This particular example, serial 00029, was amongst the initial batch of 35 to be produced, which were famously completed in Roger Linn's own home! This beyond rare, incredibly desired, and amazingly iconic artifact is equally deserving of a museum display as it is a special section in the finest studio. With approximately only 500 LM-1s produced between 1980 and 1983, they have since become incredibly scarce and especially famous for being the preeminent digital drum machine featured on recordings by; Michael Jackson, Prince, Peter Gabriel, Kraftwerk, Kurtis Blow, Devo, Elton John, Don Henley, and many more. With an original price tag of $4,995.00, and an exclusive client list that reads more like an announcement of nominated Pop, Rock, and R&B artists for the 24th Annual Grammy Awards of February 1982 than a group of guys that want the same drum machine, it has since become near impossible to find one, let alone, buy and own one. Perhaps more relevant and applicable now than ever, this is the drum machine that started it all, and just like all great vintage equipment, it has achieved a permanent place in music history."