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  • Joined: 30 Jan 2007
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Region detection on JP SMS
Post Posted: Fri Sep 08, 2017 1:29 am
Has anyone figured out how the Japanese SMS handles region detection? I was mulling over the schematics that Esrael posted last year and I'm trying to understand how it does region detection since the TH pins are actually connected to the 315-5297.
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Post Posted: Fri Sep 08, 2017 4:42 am
http://www.smspower.org/Development/RegionDetection
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Post Posted: Fri Sep 08, 2017 5:45 am
I've looked at that page and it's not all that clear when it comes to the Japanese SMS, it says it uses register $3F for region detection but then the page about port $3F says that functionality isn't present on the Japanese SMS? It's more confusing considering the Japanese SMS seems to have the TH signals present...

The reason why I ask about all this is I'd like to experiment with adding a region switch to my Japanese SMS.
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Post Posted: Fri Sep 08, 2017 5:57 am
The Japanese SMS doesn't allow you to use port 3F to output to the controllers. The region detection is checking if the functionality is present.
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Post Posted: Sat Sep 09, 2017 9:07 pm
This is an example, in Blade Eagle 3D, it detects JAP or non JAP SMS, game stores in $C001,

IF $C001=$00 THEN SMS JAP, show Sega MARK III logo
IF $C001=$FF THEN SMS Non JAP, show no logo

;)

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Post Posted: Sun Sep 10, 2017 11:10 am
That's similar to the detection code on the dev wiki.
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