Back in 2007, developer FluBBa made a plan that runs on original Sega hardware and tests the SMS mode of the VDP chip. Now, enik2 has updated the VDP test plan to run correctly on SMS, Genesis and each versions of a Game Gear as properly!
Merely load the compiled ROM onto a ROM cart, or single flash cart and run it on your Game Gear. You will require to pick the ideal test application to match your Game Gear version (1 ASIC or two ASIC), then just let the test run. Please note that operating the incorrect version of the test, or operating it on emulation will outcome in the errors shown in the screenshot above.
I envision this application will be valuable in obtaining application emulation much more compatible with original hardware, as properly as just merely testing Game Gears to see if their VDP’s are operating correctly!
A lot more Facts: http://www.smspower.org/forums/post107037#107037
Compiled ROM: http://www.smspower.org/forums/post107039#107039