via this auction
"Like most drum machines from the mid-1980s, the Roland TR-505 generates its percussion sounds by replaying pre-recorded digitized samples of real drums. These sounds are stored as pulse-code modulation data in ROM. Whereas older machines such as the LinnDrum, Oberheim DMX, etc. typically stored each sound on its own ROM chip, with dedicated digital-to-analogue converter and associated circuitry; this TR-505 includes a pre-assembled board with a ROM with samples from the Linn LM-1, LinnDrum and Oberheim DMX. The sample data from these machines is compressed (they used non-linear DAC circuitry to simulate 12-bit resolution) all controlled by 2x toggle switches.Provides four switchable banks of sounds:
Stock TR-505,
LM-1,
LinnDrum
DMX
Reversible installation - board is socketed, so you can remove it and return to the stock configuration
Basically you can have tree extra classic and hard to find drum machines for less than the price of any of them."
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