Sega Saturn Region Free BIOS

Discussion in 'Sega Saturn Programming and Development' started by Serantes, Jun 12, 2011.

  1. l_oliveira

    l_oliveira Officer at Arms

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    You can actually "bypass" the checking, but then the CD-Drive "won't deliver" (I.E.: It will not unlock so you will get read errors out of access attempts. Same thing happens with the Dreamcast if you put a GD in and it has no barcode or has it's barcode obstructed.) :thumbsup:
     
  2. derekb

    derekb Well Known Member

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    out of curiosity, are there any games which will not boot with a 4in1's region free mode that do boot with region free bios?
     
  3. Druidic teacher

    Druidic teacher Officer at Arms

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    Last edited: Jun 22, 2017
  4. Shakey_Jake33

    Shakey_Jake33 Robust Member

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    Though it should be noted that Panzer Dragoon Saga can be booted if you enter a Master Key into the Action Replay. I think it was, ironically, actually implemented anti-cheat protection, though that had the side-effect of making the game unbootable with the 4in1 without a code.
     
  5. Druidic teacher

    Druidic teacher Officer at Arms

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  6. derekb

    derekb Well Known Member

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    well, I own saga, is that the only real problem child?
     
  7. Emperor Udan

    Emperor Udan Spirited Member

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    I will receive my two multiregion bios in a couple of weeks max.
    I'll try it out and make a report on my Pal and Jap Saturn.

    Edit 1:
    Pics of motherboard from my Jap Saturn:
    http://www.sendspace.com/file/fdkbc1

    Edit 2:
    I just read again Druid II wills.
    Is it enough or you really want every component.
    I can do it again and closer for each one if you need it.
     
    Last edited: Jun 21, 2011
  8. Shakey_Jake33

    Shakey_Jake33 Robust Member

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    I'm told that the game works fine with standard import-playing cartridges though (ones without extra functionality). I could be wrong though.
     
  9. synbiosfan

    synbiosfan Spirited Member

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    Saga works with an ST-Key.
     
  10. Dr.Wily

    Dr.Wily Peppy Member

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    Not the very first model. Maybe suitable for BIOS swap.
     
  11. Druidic teacher

    Druidic teacher Officer at Arms

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  12. Dr.Wily

    Dr.Wily Peppy Member

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    It seemed that the first run of Saturn mobo has a slightly bigger mask rom. Maybe I 'm wrong. Long time since I have seen this model of motherboard.
     
  13. Druidic teacher

    Druidic teacher Officer at Arms

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  14. DarthCloud

    DarthCloud Fiery Member

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    Prettier version of the mod on my US VA7 Saturn ;)

    [​IMG]

    I used an MX29F800TMC-90 (SOP44) flash chip instead of eprom.

    The saturn use an SOIC40 chip but the only differents between the two package is that the SOP is a bit larger and have 4 more pin since it's flash and need additional IO for programming. The spacing between the pin is the same and the footprint on the Saturn PCB is large just enough to be able to solder the SOP chip.

    Once the chip programmed by an external programmer, lift pins 1, 2, 43 & 44. You can connect the /RESET (44) and /WE (43) line to Vcc and A18 (2) to GND, leave RY//BY (1) unconnected.

    All the other pins match the saturn BIOS.

    I don't have original jap games but I burned (I have a modchip) one jap game without modifying the region of the ISO and it's working fine as expected :D.

    I don't have any pal iso on hand but will try later this week. Should start in 60Hz.
     
  15. Dr.Wily

    Dr.Wily Peppy Member

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    Nice work. Also, you should test with VCD card too see if it works with this BIOS.
     
  16. Avanaboy

    Avanaboy Spirited Member

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    just a little curiosity : How he managed to modify the bios image ?
    does he disasm it ? or maybe is there another way ?
     
  17. Bad_Ad84

    Bad_Ad84 The Tick

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    IDA Pro most likely. Its the disassembling tool of choice these days.

    I used to use Windasm32 for Windows stuff years ago, before IDA pro came on the scene.
     
  18. Avanaboy

    Avanaboy Spirited Member

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    I was convinced that IDA was able to disasm only PSX Bios Files (with the plugin) :)
     
  19. n64coder

    n64coder Robust Member

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    It looks like IDA Pro retails for $540. Are people really using a legit copy? I don't know if a cheaper version exist (around $200 or less).
     
  20. Bad_Ad84

    Bad_Ad84 The Tick

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    IDA can disassemble a lot of stuff and if it cant, you can write a plugin to support it.

    its the disassembler of choice.

    see supported architectures here: http://www.hex-rays.com/idapro/gallery/index.htm

    also some more googling: http://www.hex-rays.com/idapro/idaproc.htm
    According to wikipedia, the saturn was Hitachi SH-2.

    @n64coder

    probably not, most people into that type of thing either dont mind downloading software they have not paid for or work in a field that require it (so they already have it for hobby use).
     
    Last edited: Jun 28, 2011

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