[Dreamcast] Custom BIOS

Discussion in 'Retro' started by atreyu187, Jul 20, 2015.

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    atreyu187

    atreyu187 Retired Old Hunter Moderator

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    So I figured this should be posted as it is an amazing BIOS MOD for an amazing system. Comes with or without devkit intro. It is really useful for Dreamcast ODE users as it allows images to have any LBA of the 1ST_READ.BIN (aka the Dreamcast EXE) to make games much smaller, see README below. Also disabled the VGA check so no more need to force VGA for games that work normally but only with the "VGA trick" and has all the normal mods like region free. A newer BIOS is also on the way. Till then I hope you enjoy as much as I did flashing ym Dreamcast this evening. Note you will need a BIOS replacement as the stock has read-only access.

    [​IMG]

    New BIOS will be updated on 2015 when needing to do a rest, will show region of BIOS as well as disc info. Talks of modding the swirl color (blue, orange or black) without needing to a solder to enable access to the flash ROM as well. Settings would need to be stored on VMU just like the 3D BIOS mod.

    TEASER

    [[​IMG]

    Dev Kit BIOS v1.03
    Retail BIOS v1.03

    SHA1 Hashes:
    jc-bootROM-retail-v1.030.bin: 1F385633B2438BAA1984C1194021DCA967B8D095
    jc-bootROM-devkit-v1.030.bin: 96A4B580E26B1DC696004757F588647B8172961A


    SOURCE


    Can be easily flashed with Dreamshell or by building a standalone region changer with Bootdreams for an AIO disc. I prefer installing from SD card using Dreamshell 4.0 RC-3 as my system already has internal SD mod with SATA G1-ATA hack installed.
     
    Last edited: Aug 10, 2015
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    kozarovv

    kozarovv Super Moderator

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    DC live forever!
     
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    gDrive

    gDrive Member

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    LOL you can say that again, especially when games were still being released for the system LONG after its discontinuation! :D
     
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    Bad Jester

    Bad Jester Member

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    I have never played dreamcast, about the only system I've never played. I have always heard great things about it. Would be great if it was ported to ps3. But maybe I'll try it on pc soon just to try it. I get internet back next month!
     
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    atreyu187

    atreyu187 Retired Old Hunter Moderator

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    Don't see it getting ported to PS3 anytime soon if ever or possible TBH. PC emulation is ok for DC and worth a go, doesn't even need a high end PC for NullDC. Android emulation for DC isn't bad either. WinCE games aren't compatible for NullDC or Riecast but can be done with Makaron which also supports Naomi 1 & 2
     
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    doctorwho05

    doctorwho05 Member

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    DREAMCAST is still my FAV console from the day if only the loading times didn't kill it (and Sony's AD $). Sega's News about getting back into consoles has got my inner child skipping and jumping
     
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    kozarovv

    kozarovv Super Moderator

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    Makaron is a nickname of Dreamcast in Poland. Is taken from dreamcast logo which look like makaron which mean no more, no less just, pasta. Just in case if anyone is curious.
     
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    atreyu187

    atreyu187 Retired Old Hunter Moderator

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    Learn something new still about my favorite system of all time!!

    Edit

    Also confirmed the LBA hack works for SD card loading as well as ODDE users.
     
    Last edited: Aug 10, 2015
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    psydefx

    psydefx Member

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    so im goin to do the bios mod, is 0.3mm solder fine for the job? im also goin to replace the battery since dreamcast asks for date everytime
     
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    kadorna2

    kadorna2 Member

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    If you are going to do this you might as well do a dual bios mod piggybacking another flash ROM on top of the old one and using a simple 2 position switch to change the active rom
     
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    kozarovv

    kozarovv Super Moderator

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