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View topic - How does Fantastic Dizzy on Game Gear work?

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  • Joined: 23 Sep 2021
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How does Fantastic Dizzy on Game Gear work?
Post Posted: Tue Aug 02, 2022 11:37 am
I couldn't find the answer on the internet. How does Fantastic Dizzy on Game Gear work? Is it a native conversion or is it just the same version as on the Master System but the GG cartridge works as an SMS-GG converter by running the SMS ROM on the GG screen? On emulators, the Fantastic Dizzy ROM run in GG mode displays incorrect graphics. How is it actually?
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Post Posted: Tue Aug 02, 2022 11:53 am
The same as all these others:

https://www.smspower.org/Tags/SMS-GG

It's not identical to the SMS version, but it's effectively an SMS game in a GG shell with a "built-in adaptor". Emulators that try to run it in GG mode will not work well.
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Post Posted: Wed Aug 03, 2022 11:54 am
Is it actually an adapter though in the sense of it using different pin mapping to a GG game, or simply toggling the one SMS mode pin?
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Post Posted: Wed Aug 03, 2022 1:18 pm
Just the one pin, it’s connected to ground on GG mode games and VCC for SMS mode. That’s why I put “adaptor” in scare quotes, it’s logically equivalent to a Master Gear Adaptor but then trivially reducible to just one change on the PCB.

Actually, it might be interesting to compare the PCBs of these games to GG mode games of comparable size and age.
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Post Posted: Sun Aug 28, 2022 3:51 pm
I wonder how the graphics scaling from 256x192 to 160x144 works? Is the operation of Master Gear Converters described somewhere? Does GameGear convert the resolution in any hardware, built-in way? .
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Post Posted: Sun Aug 28, 2022 6:17 pm
There was some discussion from here onwards, and in a few other topics.
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Post Posted: Mon Aug 29, 2022 9:35 am
Tom wrote
There was some discussion from here onwards, and in a few other topics.


The information in that thread is a little out of date now.

I'm fleshing out a wiki page on the topic below, I've given a brief overview of how scaling works with more to come (apologies I'm a bit of a slow typer and I want to make sure the information is accurate).

https://www.smspower.org/Development/GGLCD

I also recently posted a script that can take an image in any of the two supported SMS resolutions and accurately emulate what they would look like on a real GG display, this is based on extensive testing on real hardware and reverse engineering the signals output by the ASIC.

https://www.smspower.org/forums/19156-GameGearSMSModeLCDEmulationScript
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