via this auction
"This one is also a very late one or one of the last made by Roland, later than any other JP-8 i have seen,so it was probably made towards the end of its run in 1984. The later one got all the upgraded so made it the most reliable and most desirable one for working musician or collector,here's the info from net:
"Throughout the production of the JP-8 there were several changes. 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. Some say to avoid these early JP-8's while others say they haven't experienced tuning problems. 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. Previous JP-8's had the option of having the OC-8 retrofit installed to give it DCB capability."
Check out more info from Wiki"
Monster synth, monster price :(
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