===== POLYPHON - FPU, MIDI, PCM, 8MB memory board =====

 The Polyphon board allows using optional FPU, MIDI, acts as a hardware PCM accelerator, with the help of PCM8SB.X driver, and can be used as an 8MB (2x4MB) RAM expansion board.

|{{:x68000:polyphon_1.jpg?300|}}  |{{:x68000:polyphon_3.jpg?300|}}  |{{:x68000:polyphon_4.jpg?300|}}|

  *[[http://nfggames.com/x68000/Schematics/Polyphon/Polyphon_ROM_dumps.zip|GAL and EPROM ROM dumps]] were kindly provided by our forum member **Hyperneogeo**
  *Dipswitch settings were taken from: http://www.tur-up.net/~ta/x68k/poly_dip.html
  *[[http://gamesx.com/wiki/lib/exe/fetch.php?media=x68000:polyphon_hires_1.jpg|Polyphon Hires]] picture was found by our forum member **AnnaWu**

**Dipswitch settings**

|  **SW**  |  **Settings**  |  **ON**  |  **OFF**  |
|  1  |  Memory address $200000-$3FFFFF  |  Enabled  |  Disabled  |
|  2  |  Memory address $400000-$5FFFFF  |  Enabled  |  Disabled  |
|  3  |  Memory address $600000-$7FFFFF  |  Enabled  |  Disabled  |
|  4  |  Memory address $800000-$9FFFFF  |  Enabled  |  Disabled  |
|  5  |  Memory address $A00000-$BFFFFF  |  Enabled  |  Disabled  |
|  6  |  Math processor I / O address  |  $E9E080-$E9E09F  |  $E9E000-$E9E01F  |
|  7  |  POLYPHON ID  |  $EFF880-$EFF89F  |  $EFF800-$EFF89F  |
|  8  |  Unused  |

**Additional memory settings** [0=OFF/1=ON]

|  Existing memory  |  + 2MB expansion  |  + 4MB expansion  |  + 6MB expansion  |  + 8MB expansion  |
|  10MB  |  0 0 0 0 1  |  Invalid  |  Invalid  |  Invalid  |
|  8MB  |  0 0 0 1 0   |  0 0 0 1 1  |  Invalid  |  Invalid  |
|  6MB  |  0 0 1 0 0   |  0 0 1 1 0  |  0 0 1 1 1  |  Invalid  |
|  4MB  |  0 1 0 0 0   |  0 1 1 0 0  |  0 1 1 1 0  |  0 1 1 1 1  |
|  2MB  |  1 0 0 0 0   |  1 1 0 0 0  |  1 1 1 0 0  |  1 1 1 1 0  |
| | | | |
|  **SW Nr.**  |  1 2 3 4 5  |  1 2 3 4 5  |  1 2 3 4 5  |  1 2 3 4 5  |