Sega System 24 multi kit sale & support

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    • Sega System 24 multi kit sale & support

      1) (Long) Introduction

      This System uses either floppies or romboards to load games or both for Bonanza Bros.
      It's not JAMMA but a System 16 to JAMMA adapter works fine.
      It's mid-res, thus 24kHz.

      The multi kit allows to play all floppy based games, included encrypted ones which I have decrypted, from a floppy emulator device.
      Romboard based games are supported on a daughterboard that plugs in any romboard, whatever the security chip installed (but one must be present as it's also used for bank switching). Romboard based games have been patched to circumvent the protection.

      Supported games from the floppy emulator:
      - Bonanza Bros (W), patched - requires a romboard too
      - Crack Down (W), decrypted
      - Dynamic Country Club (U), decrypted
      - Gain Ground (W), decrypted
      - Hot Rod (Turbo 3P, W, set 2) - requires analog I/O board to boot
      - Hot Rod (4P, J, rev C) - requires analog I/O board to boot
      - Quiz Syukudai wo Wasuremashita (J), decrypted
      - Rough Racer (J), decrypted - requires analog I/O board to boot
      - Scramble Spirits (W)
      -Jumbo Ozaki Super Masters Golf (W), decrypted

      Supported games from the romboard:
      - Bonanza Bros, patched - requires the floppy controller too
      - Quiz Ghost Hunter, patched
      - Quiz Mekurumeku Story, patched
      - Quiz Rouka ni Tattenasai, patched - requires 3/4p I/O board to boot
      - Tokoro San no MahMahjan, patched
      -Tokoro San no MahMahjan 2, patched

      To enjoy the whole library you need:

      - A motherboard with a standard 68000 CPU installed for the second CPU, if the FD1094 is installed like in the picture below, pull it and install a standart 68000 CPU (original one is rated 10Mhz)



      - a floppy controller (plugs underneath the motherboard), with cables of course (data and power):





      - a romboard (plugs on top of the motherboard):



      - Also some games require extra hardware for controls:

      * 834-6510 analog I/O board for Hot Rod and Rough Racer


      * 3/4p I/O board (plugs on the smaller connector of the motherboard just like on System 18 or 32) for Quiz Rouka ni Tattenasai
      * and probably some specific hardware for the mah-jong games

      With a motherboard and the floppy controller you can play:
      - Crack Down (W), decrypted
      - Dynamic Country Club (U)
      - Gain Ground (W), decrypted
      - Hot Rod (Turbo 3P, W, set 2) - requires analog I/O board to boot
      - Hot Rod (4P, J, rev C) - requires analog I/O board to boot
      - Quiz Syukudai wo Wasuremashita (J), decrypted
      - Rough Racer (J), decrypted - requires analog I/O board to boot
      - Scramble Spirits (W)
      -Jumbo Ozaki Super Masters Golf (W), decrypted

      With a motherboard and a romboard you can play:
      - Quiz Ghost Hunter, patched
      - Quiz Mekurumeku Story, patched
      - Quiz Rouka ni Tattenasai, patched - requires 3/4p I/O board to boot
      - Tokoro San no MahMahjan, patched
      -Tokoro San no MahMahjan 2, patched

      With a motherboard, a floppy controller and a romboard you can play all listed games above plus Bonanza Bros.

      2) How to install

      The kit is composed of:
      - a USB floppy emulator with upgraded firmware
      - a USB stick
      - a small board that plugs in the motherboard
      - a bigger board that plugs in the romboard
      - jumper cables to interconnect the 2 boards from the kit

      To install the small board on the motherboard first pull IC1 and IC2, then install the board like this (better pics to come):





      The bigger board plugs in the romboard like this, again all ROMs have to be pulled first.
      Jumpers have to be set like this:
      - J2/J3/J7/J9 = closed
      - J1/J4/J5/J6/J8 = open
      - J10/J11 = 1-2
      Boards interconnection is simple, left pin with left pin, middle pin with middle pin and... right pin with right pin. You can't damage anything if you do it wrong but games won't boot.





      The USB floppy emulator plugs in place of the original floppy drive.





      Dipswitches allow to select game loader:
      DIP 1/2/3 ---- loader
      000 ---- floppy based games except Hot Rod and Bonanza Bros
      100 ---- Hot Rod (floppy)
      010 ---- Quiz Ghost Hunter (rom based)
      110 ---- Tokoro San no MahMahjan (rom based)
      001 ---- Tokoro San no MahMahjan 2 (rom based)
      101 ---- Quiz Mekurumeku Story (rom based)
      011 ---- Quiz Rouka ni Tattenasai (rom based)
      111 ---- Bonanza Bros (floppy + romboard based) => was separated from the other floppy loader as I feared conflict between the romboard and other floppy based games but it seems to be OK to use it for all floppy based games except Hot Rod

      Floppy image selection is made by using the two buttons on the front panel of the floppy emulator (-/+), segment display shows selected image (3 digit number), you have few seconds to change image on boot up (3s maybe?):
      - 000 = Bonanza Bros (W)
      - 001 = Crack Down (W)
      - 002 = Dynamic Country Club (U)
      - 003 = Gain Ground (W)
      - 004 = Hot Rod (Turbo 3P, W, set 2)
      - 005 = Hot Rod (4P, J, rev C)
      - 006 = Quiz Syukudai wo Wasuremashita (J)
      - 007 = Rough Racer (J)
      - 008 = Scramble Spirits (W)
      - 009 = Jumbo Ozaki Super Masters Golf (W)

      [EDIT]
      31/07/2108: Added 2 pics to show how pins must be aligned on the motherboard and romboard and how to plug the floppy emulator

      The post was edited 18 times, last by Apocalypse ().

    • That's good for my advertising "Play all those extremely expensive games for a tiny little small fraction of the price!" :D :D :D

      This brings the question, as romboard based games can still be found for a reasonable price from time to time (sometimes as low as $100), is it worth reproducing the floppy controller? I've built the part list, it should cost ~$50 in parts for one board plus PCBs cost. But it has to be reproduced first with a CAD tool...
      If you add labour on top of that to build the controller that's probably a "retail" price of $100 at the end.
      How do you feel about that guys?
    • Given the fact that it will allow you to play all these extra games:
      - Bonanza Bros (W), patched - requires a romboard too
      - Crack Down (W), decrypted
      - Dynamic Country Club (U), decrypted
      - Gain Ground (W), decrypted
      - Hot Rod (Turbo 3P, W, set 2) - requires analog I/O board to boot
      - Hot Rod (4P, J, rev C) - requires analog I/O board to boot
      - Quiz Syukudai wo Wasuremashita (J), decrypted
      - Rough Racer (J), decrypted - requires analog I/O board to boot
      - Scramble Spirits (W)
      -Jumbo Ozaki Super Masters Golf (W), decrypted

      I think it's worth it.
      * Arcade-projects, the site where you get the most of your arcade games.
      * If you want Drama go to Neo-Geo forum ---Darksoft
    • Definitely worth the effort and cost to build the controller. I will definitely get a full kit if you make them :thumbsup:

      I know I got 2 system 24 boards somewhere, 1 is either crack down or bonanza bros with the floppy drive, the other is a rom board game, forget which one.
      And to think I was planning to sell them off, I guess its good to hold onto certain things :)


      Wanted: Egret II,StarTrek/Metallica Pinball,Egret 29 CP Housing,Capcom Spinners
    • Apocalypse wrote:

      This brings the question, as romboard based games can still be found for a reasonable price from time to time (sometimes as low as $100), is it worth reproducing the floppy controller?
      Would it be possible to build a single board that replaces both the ROM board and the Floppy controller?

      The original floppy setup is pretty messy, I know I'd be willing to pay more for something that was more streamlined/self-contained.
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    • twistedsymphony wrote:

      Would it be possible to build a single board that replaces both the ROM board and the Floppy controller?
      The original floppy setup is pretty messy, I know I'd be willing to pay more for something that was more streamlined/self-contained.
      I've spent a lot of time trying to reproduce the security chip located on the romboard in order to be able to design a completely new one.
      I've been able to reproduce the banking mechanism but for some reason some other needed signals never worked... I guess if this Altera chip was ever dumped I could merge my designs and make a "all-in-one" board (romboard + floppy controller + analog I/O board).
      But then final price would be probably close to $300.

      Let's say the actual design of the kit is V1, there might be a V2, maybe not.