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PostPosted: Fri Mar 18, 2016 11:33 am 
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Joined: Fri Mar 18, 2016 11:24 am
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Hi everybody,

I search about the different released BIOS version of retail Dreamcast (not DevKits).

I found those version exist : v1.004, v1.01c, v1.01d, v1.022.

I think that the v1.022 is the "non MILCD" BIOS, the last BIOS update from SEGA.

But i ask myself, if there early versions, for example a v1.01a or v1.01b ?

I need to list the complete set.


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PostPosted: Thu Apr 21, 2016 3:02 am 
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Joined: Mon Dec 10, 2007 5:04 am
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v1.004 = VA0
v1.01d = VA1
v1.022 = VA2

v1.01c is not really retail. comes from a single VA0 PAL, all PAL retail are >= VA1.
this VA0 PAL has been sold on ebay, here's pictures :
- from original announce : displaydreamcast-1.jpg displaydreamcast-2.jpg displaydreamcast-3.jpg displaydreamcast-4.jpg
- from buyer/dumper : IMG_1874.JPG IMG_1878.jpg IMG_1880.jpg IMG_1892.jpg IMG_2105.jpg


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PostPosted: Thu Apr 21, 2016 3:59 am 
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Joined: Sun May 18, 2014 3:05 pm
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true
here is more photos from owner/dumper
https://picasaweb.google.com/1019852149 ... redirect=1

on picture below is most likely manufacture month/year
https://picasaweb.google.com/1019852149 ... 5109553314
if so - this unit was made April 1999, a half year before official Dreamcast release in Europe.

ps: however, 1.01d and have no real changes compared to 1.01c, there was just corrected typo in iirc Italian translation - word 'dischetto' changed to 'disc' in few places

in general, some people (including me) tend to think DC BIOS version used in particular consoles is not tied to motherboard revision, but mainly to manufacture date


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PostPosted: Sun May 15, 2016 5:25 pm 
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Joined: Fri Mar 18, 2016 11:24 am
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Hi,

Thanks for your answers :)

So if i understand, v1.01c is a unique BIOS version and v1.004, v1.01d and v1.022 represent the only all BIOS versions for retail Dreamcast (including US/JP/PAL models) ?

Regards.


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PostPosted: Mon May 16, 2016 2:33 am 
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Joined: Sat Mar 22, 2014 3:54 am
Posts: 9
I guess the VA0 console has a region free bios and was made, as written on the console itself, to demo some japanese games before the PAL games came out.


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PostPosted: Mon May 16, 2016 3:31 am 
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Joined: Sun May 18, 2014 3:05 pm
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DevDC wrote:
v1.004, v1.01d and v1.022 represent the only all BIOS versions for retail Dreamcast (including US/JP/PAL models) ?

correct.
with small addition - v1.004 is JP only (at that moment there was no US/EU models yet) and boot Japan region only discs (it have no code which change region based on Flash ROM contents)
later revisions v1.01d and v1.022 was used in all(?) regional JP/US/PAL units.


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