"The history of the Jupiter 8 in regarding the different versions is. Starting at serial #171700 the D/A converter on the Interface board was changed from 12-bit to 14-bit. This change was made mainly to improve tuning stability. The problem with the 12-bit digital-to-analog converter on the original JP-8 is that it could cause the autotune to be inaccurate in some instances. Starting at serial #242750 the LEDs of the display were changed to brighter ones. Starting at serial #282880 the JP-8 came standard with a DCB port. These newer JP-8's may be referred to as JP-8A's. DCB, or Digital Control Bus, was Roland's pre-MIDI interface that allowed the JP-8 to talk to other DCB enabled hardware, such as the Roland MC4 and MC8 microcomposers."
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