Roland SERVICE INFORMATION NO 100227

                                     JP-6
    
                                    SUBJECT
    
                   
                            PROM Version up on JP-6
                                                               
                                                              
    
              Now we have three types of PROM like Ver. 4.0, 5.0 and 6.0 for JP-6.

      1) Ver.4.0 ... For current JP-6 production This Ver. 4.0 PROM is in
                     correspondence with MIDI Standard 1.0. However, this
                     PROM has no MIDI Select function on the strategic
                     policy of JP-6's sales as well as the other
                     preliminary MIDI Instruments like JX-3P or HP-
                     300/400.

      2) Ver.6.0 ... For changing MIDI Channel (Commercial one). This
"THE BEST ONE !!"    PROM Ver. 6.0 is also in correspondence with MIDI
                     Standard 1.0, and has MIDI Channel Select function.
                     So this PROM Ver.6.0 is recommended for MIDI Link.

      3) Ver.5.0 ... For a service use only
                     This PROM Ver.5.0 is used for setting MIDI Mode
                     on power up to "OMNI OFF/POLY".
                     As you know, JP-6 equipped with Ver.4.0 PROM will be
                     in "OMNI ON" when power up. In this condition, JP-6
                     will respond to all MIDI channel messages (OMNI
                     ON mode). When YAMAHA MIDI Instrument like DX-7
                     is connected with JP-6 as a master unit for JP-6,
                     YAMAHA MIDI Instrument does not transmit "OMNI
                     OFF" mode message. The reason why YAMAHA has not
                     been using "OMNI ON/OFF" mode on YAMAHA MIDI                                                       M I   L
                     Instruments is only his own policy but it doesn't
                     meet MIDI ver. 1.0. 
                     So JP-6 (with PROM Ver.4.0)
                     cannot change MIDI mode from OMNI ON to OMNI OFF by
                     itself. This means JP-6 cannot use with the specific
                     MIDI Channel in MIDI Link. Recently we are getting
                     some requirements from customer for controlling JP-6
                     with the specific MIDI Channel when connected with
                     DX-7. So this time we made PROM Ver. 5.0 only for the
                     above special purpose. The difference from Ver.4.0
                     is to set MIDI mode on power up to "OMNI OFF". The
                     other functions are strictly same as PROM Ver. 4.0.


        For your reference, the following table is the compatibility
        chart between these PROM's.
    
                           _________________________________
                          I Ver.4.0  I Ver.5.0   I Ver.6.0  I
               ___________I__________I___________I__________I
              I POWER ON  I          I           I          I
              I DEFAULT   I OMNI ON  I OMNI OFF  I OMNI OFF I
              I___________I__________I___________I__________I
              I MIDI CH   I          I           I          I
              I SELECT    I   NONE   I   NONE    I ENABLE   I
              I___________I__________I___________I__________I
              
        This time we decided to install Ver.6.0 PROM into JP-6 as
        standard equipment.

           Details as follows : 

        1) Effective:    From S/N 494750 (our December Production)

        2) Indication:   Brown round sticker put by VOLTAGE INDICATION on
                         packing

        3) Owner's Manual:  The information that PROM Ver. 6.0 has
                            MIDI Channel Select function will be added to
                            this Owner's Manual with attached paper.