case 0x4800: {
      uint16 counter = (r4809 + (r480a << 8));
      counter--;
      r4809 = counter;
      r480a = counter >> 8;
      return codec.output[(decomp_offset++) & 0xffff];
    }

void SPC7110_4800()
{
  WRITE_WORD16_LE(SPCCompressionRegs+9, READ_WORD16_LE(SPCCompressionRegs+9)-1);
  if (decompression_state.table_current)
  {
    SPCCompressionRegs[0] = read_decompress();
  }
}

    case 0x4806: {
      r4806 = data;

      unsigned table   = (r4801 + (r4802 << 8) + (r4803 << 16));
      unsigned index   = (r4804 << 2);
      unsigned length  = (r4809 + (r480a << 8));
      unsigned addr    = datarom_addr(table + index);
      unsigned mode    = (memory::cartrom.read(addr + 0));
      unsigned offset  = (memory::cartrom.read(addr + 1) << 16)
                       + (memory::cartrom.read(addr + 2) <<  8)
                       + (memory::cartrom.read(addr + 3) <<  0);

      //this can technically be 65536, but it has never been observed higher than 32768 ...
      //really need a way to determine both compressed and decompressed lengths, though.
      static const unsigned max_length = 32768;

      offset = datarom_addr(offset);
      for(unsigned i = 0; i < max_length; i++) codec.buffer[i] = memory::cartrom.read(offset + i);

      #if 0
      printf("decompression: 4805=$%0.2x,4806=$%0.2x,4807=$%0.2x,4808=$%0.2x,480b=$%0.2x\n",
        r4805, r4806, r4807, r4808, r480b);
      printf("table=$%0.6x,index=%3d,length=%5d,mode=%d,offset=$%0.6x\n",
        table, r4804, length, mode, offset);
      #endif

      switch(mode) {
        case 0: codec.decomp_mode0(max_length); break;
        case 1: codec.decomp_mode1(max_length); break;
        case 2: codec.decomp_mode2(max_length); break;
      }

      decomp_offset = (r4805 + (r4806 << 8)) << mode;
      r480c = 0x80;
    } break;

void SPC7110_4806w()
{
  if (decompression_state.graphics_buffer)
  {
    init_decompression(READ_WORD24_LE(SPCCompressionRegs+1), SPCCompressionRegs[4], READ_WORD16_LE(SPCCompressionRegs+5));
  }

  SPCCompressionRegs[0xC] = 0x80;
}