System 18 multi - 4) Pinning out connectors

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    • System 18 multi - 4) Pinning out connectors

      Given there's no documentation on System 18 I had to pin out the 4 connectors mainboards have.
      Pins names are only a personal interpretation and might not reflect the true function behind them.
      Most of them can be determined by probing ROM sockets.
      For a few of them I had to follow the signal on the motherboard to understand better their function.

      CN1123456789101112131415161718192021222324252627282930
      BD1_FIXD3_FIXD5_FIXD7_FIXD9_FIXD11_FIXD13_FIXD15_FIXD17_FIXD19_FIXD21_FIXD23_FIXA14_FIXA12_FIXA10_FIXA8_FIXA6_FIXA4_FIXA2_FIXA0_FIXA16_FIXA18_FIXGnd!RST GndGndVccVccVcc
      AD0_FIXD2_FIXD4_FIXD6_FIXD8_FIXD10_FIXD12_FIXD14_FIXD16_FIXD18_FIXD20_FIXD22_FIX A13_FIXA11_FIXA9_FIXA7_FIXA5_FIXA3_FIXA1_FIXA15_FIXA17_FIXVcc GndGndGndVccVcc

      CN412345678910111213141516171819202122232425
      BD1_PRGD3_PRGD5_PRGD7_PRGD9_PRGD11_PRGD13_PRGD15_PRGD1_SNDD3_SNDD5_SNDD7_SND!LWR ROM1 A17_SNDA15_SNDA13_SND GndGndVccVcc
      AD0_PRGD2_PRGD4_PRGD6_PRGD8_PRGD10_PRGD12_PRGD14_PRGD0_SNDD2_SNDD4_SNDD6_SNDOE_PRG
      (!RD)
      CE_PRG
      (ROM0)
      A18_SNDA16_SNDA14_SND !EXCS GndGndVccVcc

      CN3302928272625242322212019181716151413121110987654321
      AVccVccGndGndGnd(D4 latch)OE_SND CE2_SNDCE0_SND A11_SNDA9_SNDA7_SNDA5_SNDA3_SNDA1_SND A18_PRGA16_PRGA14_PRGA12_PRGA10_PRGA8_PRGA6_PRGA4_PRGA2_PRGA0_PRG
      BVccVccVccGndGnd CE3_SNDCE1_SND A12_SNDA10_SNDA8_SNDA6_SNDA4_SNDA2_SNDA0_SND A19_PRGA17_PRGA15_PRGA13_PRGA11_PRGA9_PRGA7_PRGA5_PRGA3_PRGA1_PRG

      CN225242322212019181716151413121110987654321
      AVccVccGndGndGnd A14_SPRA12_SPRA10_SPRA8_SPRA6_SPRA4_SPRA2_SPRA0_SPRA18_SPRA16_SPRD14_SPRD12_SPRD10_SPRD8_SPRD6_SPRD4_SPRD2_SPRD0_SPR
      BVccVccVccGndGnd GndA15_SPRA13_SPRA11_SPRA9_SPRA7_SPRA5_SPRA3_SPRA1_SPRA19_SPRA17_SPRD15_SPRD13_SPRD11_SPRD9_SPRD7_SPRD5_SPRD3_SPRD1_SPR
      Looking for:
      - OutRun boardset even untested or not working
      - Sega Super Scaler hardware (Out Run, Model X, Model Y), even with faulty PCM chip



      01010011 01000101 01000011 01010010 01000101 01010100 00100000 01001101 01000101 01001110 01010101 00100000 01000111 01010101 01011001