Type 0 -x9x

Type 1 -xGx

Type 1 -xJx, -xKx, Upgrade DX-50

  CPU Osc  Model
  25MHz    -xJx
  33MHz    -xKx
  50MHz    Upg DX-50

Type 1 Upgrade DX2-66

Type 2 -xHx, -xLx  

Type 3 -xMx  Only double deck complex

Type 4 -xNx

Type 4   -xPx

Type 4 -xQx

Type 4 -xYx