Few general questions a dreamcast system.

[/dreamcast]

So I'm asking because I recently purchased a "PAL" Dreamcast on ebay (which I have been wanting for a long time) and the problem is that the seller happened to have received it in a lot a while ago and doesn't know much about the system and there's some things that don't make sense to me with it. So I'm turning to the web for some guidance:
For reference, it does have a PAL PSU 220v and PAL shell. Here's where things get funny. The seller stated that it was tested and runs with games (which i verified running an NTSC verstion of MVC 2 cdi rip after swapping a 110v psu) so the system is a VA1. Yet, when I turned it on, the dreamcast swirl was red like Japanese or North America, not the Blue like a regular PAL bios; and the language when I first booted was Japanese I think. So I'm thinking this is a Frankenstein system. So here's my questions.

1. How do you determine the bios of a system?
   
2. Would the seller be able to plug a PAL system into a north american plug and the system work (I know an NTSC PSU would blow in PAL region due to the voltage difference)
   
3. If this is a Japanese, is there a way to flash the bios?
   

4.I am running a VGA to scart cable, and then to an HDMI adapter (although I have an OSSC on order now) and will be installing a GDEMU when that arrives as well. so I don't need to worry about the 50hz to 60hz difference for picture Would this impact the boot process?
Thanks guys!

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