Game Gear games that are not working on the lastest Bizhawk Dev 2020-11-07

LAST MODIFIED (July 22 2019)

A quick summary of the games that are not fixed yet

• Pro Yakyuu GG League (doesn't boot)
• World Derby (Intense glitching when you want to start the actual game from the menu)
• Power Drive (intense flickers)
• Tarzan : Lord of the Jungle ( glitched number at the bottom of the screen)
• Fray: Shugyouhen (minor graphic glitches on the right side of the playfield)
• Urban Strike (hissing and irritating static that is not present in Kega during the intro where the music play)
• Pop Breaker (Input doesn't work)
  NOTE : According to SMS Power (http://www.smspower.org/Development/PopBreaker-GG). Pop Breaker has an issue if played on a non Japanese Game Gear. Changing the region to Japan does not fix the problem.
  "Pop Breaker does not work on export Game Gear systems because the code to read the start button does not mask out the region bit (port 00h bit 6)."

On Kega Fusion:

• Fray: Shugyouhen doesn't display graphics glitches on the right side of the playfield.

Picture 1 KEGA FUSION

Picture 2 BIZHAWK LASTEST VERSION

[alyosha-tas]

Thanks for the testing. This will probably take a while to sort out.

Pac Attack though is fixed by basic emulation (tracking writes) to Port $05 (link cable)

I don't understand the graphics corruption in some of the others, it looks like some are combination SMS / GG ROMs? maybe something isn't being initialized correctly.

EDIT : I added Castle of Illusion Starring Mickey Mouse (USA, Europe) and Rastan Saga (Japan) to the list of the game who ask for bios

[alyosha-tas]

Ok, so most of these are game gear games that are running in SMS compatibility mode.
I didn't know such a mode existed. I can find very few mentions of it in documentation.
Apparently it is accessed by connecting a pin in the cartidge slot:

http://www.smspower.org/Hardware/MasterGearConverter

Should be fixable with a bit of work, now that I understand what is going on.

[alyosha-tas]

Terminator needed SRAM to display background, probably for smoe others too.

[alyosha-tas]

I added in Compatibility mode for the core and added some of the games to the DB.

Here is the current list of not working games (or ones that I haven't looked at yet):

Prince of Persia (USA, Europe)
Predator 2 (USA, Europe)
WWF Wrestlemania Steel Cage Challenge (Europe)
Castle of Illusion Starring Mickey Mouse (USA, Europe)
Rastan Saga (Japan)
Double Dragon (USA, Europe) (missing background)
World Derby (Japan) Some menu and the main game are horribly glitched, thought the game does not crash)
Ecco The Dolphin (USA) (pink screen, unplayable)

Probably now they can all be fixed just by updating the gameDB entries.

Thank you for the quick answer! So far, I have recorded about 200 game gear out of 363 for my youtube project, so im glad more game are going to be fix!

EDIT: Refer to the first post for the games that are working or not

Just a quick headup since the issue was referenced. The test were done on the dev version

The Terminator is fixed in the dev, its background now appears
Outrun Europe and R.C. Grand Prix, which are rare case of Game Gear games using the SMS compatibility mode, now work as well
Pac-Attack is fixed

Now, for the games that does not work or are super glitched

Black/Pink screen or unplayable
Pro Yakyuu GG League
Pro Yakyuu GG League '94
Ecco the Dolphin

Games asking for the firmware, not being regonised by Bizhawk
Prince of Persia (USA, Europe)
Predator 2 (USA, Europe)
WWF Wrestlemania Steel Cage Challenge (Europe)
Castle of Illusion Starring Mickey Mouse (USA, Europe)
Rastan Saga (Japan)

The following games can be run but have heavy glitches
Double Dragon (USA, Europe) (missing background)
Taito Chase H.Q. (USA) (Horribly glitched to the point that its unplayable)
World Derby (Japan) Some menu and the main game are horribly glitched, thought the game does not crash)

The following games run but have minor glitches
Fray: Shugyouhen (The right side of the screen display garbled grapchics)
Power Drive (the game flicker horribly, but this may be intentional)

This is what ive found so far, I didn'T test the remaining Game Gear I didn't record yet, but I will update if I find more. For now, I am not checking hacks or pirated games

here another one

Tails Skypatrol

[Asnivor]

Double dragon is now fixed in the master branch (latest dev build)