Allen Organ Company Museum Tour
The Digital Revolution: 1971...

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MOS-1 Board

MOS-1 Board
This circuit board was the heart of early Allen Digital Computer Organs. Utilizing components known as MOS (Metal Oxide Silicon), the board contained 22 LSI devices, the equivalent of 48,000 transistors. This tremendous amount of circuitry-by 1970s standards-enabled Allen to produce the detail and accuracy of sound never before possible.
sound-control cabinet
Miniaturization has always been an evolutionary process; an external cabinet was still needed in the engineer model to house the collection of digital boards comprising an average organ-but the sounds it stored included many times the capabilities of the preceding analog-transistor systems.

engineers testing

Digital engineers testing one of the original "MOS/LSI" circuit boards in 1970.