Polysix MIDI retrofit - hardware changes to Polysix
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(c) Copyright 1997 Ricard Wolf


1. Cut track from KLM-367-IC32 (5514 RAM) pin 18.

2. Cut Track from KLM-367-IC25 (4011 near 5514) pin 14.

3. MIDI retrofit board battery supply (6264 pin 28) connected to cathode of
   diode near KLM-367-IC32 (5514).


4. Cut track from KLM-366-IC4 pin 1 (4175) to solder pad.

5. Solder a jumper from KLM-366-IC4 pin 1 to pin 16 of the same chip.


6. Cut track from KLM-366-D3 anode

7. Solder a jumper from KLM-366-D3 anode to following solder pad near
   8049 socket (solder pad marked with @)

          ---------|
             * * * |  *      VR14
                   |   * 
             8049  |    *
                   |     @
             * * * |          *
          ---------|        *



8. Cut tracks from 'A' and 'C' LED anodes on KLM-371.

9. Solder 470R resistors between the LED anodes and +5V (+5V obtainable
   at resistors for 'B' and 'D' LEDs).


10. Cut KLM-367-IC5 pin 3 from circuit board.

11. Solder a jumper from pin 3 to pin 7 on this IC.


12. Remove KLM-366-R118 (10k)

13. Solder a jumper from KLM-366-IC5 pin 13 to KLM-366-IC2 pin 14.

14. Solder a jumper from KLM-366-IC2, pin 15 to KLM-366-IC30 pin 6
    (use solder pad for R118).


15. Remove KLM-367-R58 (4k7) and KLM-367-R72 (4k7)


16. Cut tracks from KLM-369-IC2 pins 2 and 4 to -5V bus (running under 
    center of IC).

17. Cut tracks from KLM-369-CN09 pins 6,5 and 2 (LFO, MOD and BEND).

18. Solder a jumper from KLM-369-CN09 pin 2 (BEND) to KLM-369-IC2 pin 2.

19. Solder a jumper from KLM-369-CN09 pin 5 (MOD) to KLM-369-IC2 pin 4

20. Solder a jumper from BEND CV on the new S/H board (marked BEND RANGE 
    on the S/H schematics) to the BEND RANGE pot (KLM-369-VR3) CW terminal.


On wheel ass'y:

21. Desolder the blue (1x) and yellow (2x) wires from the MOD pot.

22. Solder the two yellow wires together and isolate them using tape or
    by burying them in a lump of epoxy or wood glue.

23. Isolate the blue wire using tape or by burying it in a lump of glue.

24. Swap the orange and brown wires on the BEND pot, while at the same
    time soldering jumper to the two corresponding terminals on the MOD 
    pot (i.e. CW to CW, CCW to CCW).